Matching Design and Fluid Analysis of Vehicle Electronic Water Pump

The water pump is the heart of the liquid delivery of the automobile cooling system, and its normal operation has an important impact on the operation, reliability and comfort of the vehicle. According to different power sources, automotive water pumps can be divided into mechanical water pumps and electronic water pumps. Among them, the biggest advantage of the electronic coolant pump is that the speed can be controlled, which can not only reduce energy consumption, but also improve the heat dissipation effect. Hoon Cho et al. used electronically controlled electric water pumps to replace traditional water pumps. Through experiments and simulation analysis, they found that by controlling the speed of water pumps and improving the efficiency of electronically controlled water pumps, the power consumption was reduced by more than 87%. If the speed of water pumps is increased to the maximum value, The radiator size can be reduced by more than 27%, which has great potential for improving engine performance and fuel economy.

Different from the optimized design of traditional mechanical water pumps, the speed of electronic water pumps is controllable and adjustable, which makes the design of electronic water pumps more flexible and flexible, but at the same time increases the difficulty of designing both efficiency and energy consumption. This paper will refer to the existing pump design, adjust and optimize according to the new project requirements, and predict through numerical simulation before the test verification, so as to avoid invalid tests and speed up the development and design process of the pump.

1 Vehicle electronic water pump demand matching

The working temperature of the driving system of new energy vehicles and the thermal management system of the power battery is quite different, so the same model often needs to be equipped with multiple water pumps of different specifications to match the cooling cycle of different temperature requirements.

1.1 Analysis of Vehicle Thermal Management Requirements

The drive system includes drive motor, motor controller and reducer. The drive motor and the controller will generate a lot of heat when they are running under heavy load. Excessive temperature is not conducive to the operation of the motor or even burns out. If the temperature of the lubricating oil in the high-speed reducer is too high, the viscosity will decrease, which will affect the lubrication effect. Lithium-ion power batteries of electric vehicles will generate heat during charging and discharging, especially during fast charging and high-power discharging. If the temperature is too high or too low, it will affect the battery life and performance, and even spontaneous combustion. In addition, components such as chargers, inverters and DC transformers also require cooling systems. In this paper, the drive system and power battery are selected as the main cooling objects, and the electronic water pump for vehicles is studied and analyzed.

1.2 Cooling system structure

Based on the research status of electric vehicle cooling system, this paper intends to use water cooling to cool or adjust the temperature of the drive system and power battery. As shown in Figure 1, the vehicle cooling system consists of one “big cycle” and two “small cycles”. In addition to the conventional water-cooling cycle used for the car’s own components, the air-conditioning system for passengers in the car will also be involved in the thermal management of the vehicle to enhance or share the heat in the cooling cycle.

2 Electronic water pump scheme design

The hydraulic mechanical design of the electronic water pump for vehicles is similar to that of the mechanical water pump. The main difference lies in the motor of the electronic water pump and its controller. The speed of the water pump is no longer coupled with the speed of the engine. Matching control commands. Since the development and design process of the electronic water pump used in the power battery cooling system and the driving system cooling system is similar, one of them can be selected as the research object. Here, the electronic coolant pump used in the cooling system of the drive system is taken as an example for research and analysis. The electronic water pump for vehicles consists of three parts: a centrifugal water pump, a brushless DC motor (Brushless Direct Motor, BLDC Motor) and a motor controller. Among them, the impeller of the water pump is integrated with the shaft of the motor, so the structure is compact and the mechanical loss is small. The rotor of the motor drives the impeller of the water pump to rotate, sucking in the coolant from the vertical direction and throwing it to the inner wall of the pump volute. and energy into the next cycle.

Application trend of automotive electronic water pump technology

As a key component of the automotive thermal management system, the electronic water pump plays an important role in the intelligent control of the temperature of the automotive subsystems, ensuring the safe and reliable operation of the subsystems, and reducing energy consumption. This paper introduces the basic structure, principle, advantages and disadvantages of mainstream electronic water pumps, analyzes its different application requirements in major systems such as internal combustion engines, new energy pure electric vehicle drive systems, and power battery thermal management, and analyzes the application and technology of electronic water pumps. Development trends are inferred.

Electronic water pump is a key component in the automotive cooling system. It is mainly used in the main cooling system of the internal combustion engine, the turbocharger cooling circuit and the air intake intercooling system. It is also used in the drive system of new energy vehicles and the thermal management system of the power battery. The use of intelligently controlled electronic water pumps in the above systems can enable the temperature of the cooling system to be closed-loop controlled according to real-time working conditions, and reduce energy consumption while ensuring the reliability of the cooled components.

1 The mainstream structure, principle and advantages and disadvantages of electronic water pumps
The electronic water pump is composed of three basic parts: hydraulic machinery, motor and motor controller. According to its fluid sealing structure, it is mainly divided into dry type and wet type electronic water pump. The hydraulic mechanical part and the motor part of the dry electronic water pump are separated independently and connected by a shaft. The water pump and the motor are sealed and isolated by rotating dynamic seals. The motor casing, water pump casing and motor controller casing are connected as a whole, and the motor drives The impeller of the water pump rotates. The wet electronic water pump is designed with a sealed thin-walled bushing between the rotor and the stator of the motor, and the rotor of the motor is integrated with the impeller of the water pump. When working, the rotor of the motor is immersed in the fluid medium, the magnetic field generated by the stator coil penetrates the thin-walled bushing and the magnetic field of the permanent magnet of the rotor forms a loop, driving the rotor and impeller to rotate, and the motor controller is installed next to the motor.

2. Application of electronic water pump technology in internal combustion engines
2.1 Application of internal combustion engine main cooling water pump
At present, the main cooling water pump of most internal combustion engines is a mechanical pump, which is installed at the front end of the engine. The driving force is provided, and the water pump and the crankshaft rotate synchronously according to a fixed transmission ratio. The disadvantage of this design is that the speed of the water pump can only rise and fall synchronously with the speed of the engine. When the engine needs to warm up quickly at low temperature, it does not need a large coolant flow, but the water pump cannot run at a low speed. However, when the engine is under low-speed and high-load conditions, a large flow of liquid cooling is required, and the water pump cannot run at high speed at this time. When driving at low load and high speed, the air cooling effect is good, and a large coolant flow is not required, but at this time the water pump is running at high speed. In order to ensure a reliable cooling effect under special working conditions such as low speed and heavy load, the mechanical pump must be designed with relatively high power. However, under most non-special working conditions, the pump operates with excess power, resulting in unnecessary energy consumption.

Because of these deficiencies in mechanical water pumps, electronic water pumps are gradually being applied to the main engine cooling system. The speed of the electronic coolant pump is no longer directly related to the engine. The electronic control unit (ECU) collects parameters such as engine speed, load, and water temperature through sensors, and compares them with the calibrated optimal water temperature under corresponding working conditions to control the water pump speed. Realize closed-loop control of liquid temperature. Its advantage is that it can control the operating temperature of the engine in the optimal range, thereby improving the thermal efficiency of the engine and reducing fuel consumption, while achieving rapid warm-up under low temperature conditions. The speed of the electronic water pump is independently controlled, and it does not need to run at full power when it is not the maximum cooling demand. The maximum power and average operating power of the electronic water pump are much lower than those of the mechanical water pump.

The power of the electronic water pump is mainly distributed between 50 and 600 W. For cars equipped with ordinary generators and ordinary 12 V batteries, the power consumption and current of this power section are still too large. The electric energy that drives the water pump is generated by the generator driven by the engine, and the multi-stage conversion of energy brings about a large loss of efficiency. And because the electronic water pump involves technologies in multiple fields such as electronics, software, motors, and hydraulic machinery, it is very difficult, and the failure of the water pump will also lead to serious consequences of engine damage, so its reliability is extremely high. Previously, only a few international auto parts companies had mature technologies and products. These factors made the application cost of the main cooling electronic water pump very high and it was difficult to popularize it.

As cars become more efficient at recovering energy to generate electricity during braking, the recovered electricity is most suitable for driving accessories such as water pumps. After years of research and development, some auto parts companies have also launched a series of cost-effective electronic main water pump products, which are now supporting mainstream auto manufacturers. After solving the power consumption and cost problems of the water pump, the electronic water pump for main cooling of the engine will quickly become popular due to its unique advantages.

2.2 Application of electronic water pump in turbocharger cooling circuit
Due to the high-temperature exhaust gas and high-speed rotation of the turbocharger, the temperature at the turbine end will reach above 600°C, while the working temperature of the sealing ring needs to be controlled below 230°C, and the bearing needs to be controlled below 150°C, otherwise the turbocharger will be damaged quickly , so efficient cooling is key. Turbochargers are generally designed with a liquid cooling circuit, but after the engine stops, the mechanical main water pump will also stop working. Without cooling of the circulating liquid, heat soaking will cause damage to the bearings, shafts and seals of the turbocharger. To solve this problem, a 15-30 W auxiliary electronic water pump is generally configured in the turbocharger cooling circuit to continue to provide cooling for the supercharger after the engine is shut down.

2.3 Application of electronic water pump in air intake intercooling circuit
Due to the high-temperature heat conduction at the turbine end of the turbocharger and the heat generated by the compression of the air, the temperature of the air passing through the turbocharger compressor can reach 150°C, while the temperature of the air entering the engine should generally be controlled below 50°C. Compressed air is used to cool the air, and the current mainstream technology uses liquid cooling plus air cooling to cool the intake air. In a supercharged engine equipped with a mechanical main water pump, a small electronic water pump of 30-60 W is often configured in the liquid cooling circuit of the intercooler to control the intake air temperature. The electronic water pump is used in the air intake and intercooling system, which can solve the cooling demand of the turbocharger through the layout of the pipeline. In engines using external exhaust gas recirculation (EGR) technology, the liquid cooling circuit of the EGR cooler is generally connected in parallel with the intake air intercooling circuit to achieve exhaust gas cooling.

2.4 Internal combustion engine thermal management system based on electronic water pump
After the engine uses the electronic main water pump, it can realize the shutdown cooling function. On this basis, the thermal management system is equipped with an electronically controlled valve group that can control the flow direction and flow of the cooling circuit, so as to realize the matching of the needs of each cooling circuit, and does not need to be equipped with multiple The water pump can better meet the thermal management needs of various parts of the engine. At present, General Motors has used this technology on the CSS series of new engines. However, its thermal management system and electronic water pump are designed and arranged separately and connected by pipelines. The integrated design of pump and valve can save installation pipelines, optimize layout space and reduce pipeline interfaces, which is conducive to cost reduction. It will become the development trend of engine thermal management technology in the future.

3 Application of electronic water pump technology in new energy electric vehicles
The application of electronic water pumps in electric vehicles is mainly the liquid cooling circuit of the drive system and the liquid cooling circuit of the power battery. The drive system includes a drive motor, a motor controller and a reducer. The drive motor generates a lot of heat when it is running under heavy load, and the high-power device IGBT in the motor controller will also generate a lot of heat. Excessive temperature will reduce the efficiency of the motor and electric control. drop, temperature runaway can lead to serious consequences of rapid burnout. In order to ensure good lubrication in the high-speed reducer, it is also necessary to control the temperature of the lubricating oil through the heat exchanger. Therefore, the driving system is generally designed with a liquid cooling circuit, and the temperature of the cooling liquid is generally required to be controlled within 90°C. The general power of the  small electronic coolant pump used in this system is 40-60 W.

The lithium-ion power battery of an electric vehicle will generate heat during charging and discharging, especially during fast charging and high-power discharging. The discharge performance and cycle life are reduced, and thermal runaway may also cause the power battery to spontaneously ignite. Therefore, the power battery is designed with a thermal management system of liquid circulation. In the liquid circulation circuit, there is a heat exchanger for heat exchange with the air conditioning system, an electric heater for heating the liquid, and an electronic water pump to drive the liquid circulation, which can realize the power battery. The temperature of the power battery is controlled at 10-55°C, the temperature of the liquid in the battery thermal management system is generally lower than 50°C, and the power of the mini electronic water pump is generally 50-120 W.

There are also components such as chargers, inverters and DC transformers in electric vehicles, which also need to use liquid cooling systems. Due to the large difference in the control temperature range of the drive system and battery thermal management, the same cooling system cannot be used, so more than two electronic water pumps are generally used. The difference between the electronic water pump used for electric vehicles and the electronic water pump used for internal combustion engines is that the temperature of the working medium of the internal combustion engine water pump can reach 120 °C, and the ambient temperature can reach 150 °C, and its high temperature reliability requirements are extremely high. The electric vehicle water pump not only needs to work when the car is running, but also during the charging process, and its service life is required to be higher.

Detailed explanation of the installation and advantages of TOPSFLO car preheater water pump

As a pioneer brand of small DC water pumps, TOPSFLO has achieved innovative breakthroughs in water pump solutions in solar energy, water heating mattresses, battery cooling, hot drink machines and other fields since its birth in 2005. It has won many praises from the market and customers. In the field of automotive preheaters, the preheater electronic water pump developed and produced by TOPSFLO has also been widely praised by high-end automotive preheater manufacturers at home and abroad, and has reached long-term &in-depth cooperation with the leading domestic preheater military supplier.

So, what models can the TOPSFLO preheater water pump be matched with? And what are the advantages of using TOPSFLO pumps? This article will explain doubts in details.

Principle of car preheater water pump
The car preheater realizes that cars don’t need to heat the garage in winter, and eliminates the trouble of difficult starting after parking. Even in the freezing cold of minus 30 degrees, you can leave at will and travel at any time. At low temperatures, the car preheater heats the car’s engine, while heating the car’s interior and helping to defrost the windows. The heat source of the fuel vehicle engine preheater comes from the burning gasoline, which can be used after the engine is turned off, or can be used as auxiliary heating during driving.

So what role does the car preheater water pump play in it?
The water pump of the automobile engine preheater draws out the coolant in the engine body, heats it through the automobile engine preheater, and then circulates it into the engine body, thereby heating the engine and achieving the purpose of starting the engine in low temperature conditions.

What preheater heater model does TOPSFLO car water pump match with?
TA50 series can be matched with 5KW liquid heater
TA60 series can be matched with 10KW liquid heater

TOPSFLO Car Preheater Water Pump Installation Guide
We recommend that you install the pump between the outlet of the engine and the heat exchanger of the interior heater. The water flow direction is the water outlet of the engine -> the inlet of the preheater water pump (the direction of the central axis of the circulating water pump) -> the outlet of the preheater water pump (the tangential direction of the circulating water pump) -> the cooling water inlet of the preheater (marked with “IN”) -> cooling water outlet of the preheater (marked with “OUT”) -> interior heater heat exchanger.

The circulating water pump should be installed at a position lower than the preheater.
Fasten the water pipe joint with the pipe clamp in the accessory bag.
Do not extend the water pump wiring harness. The distance between the water pump and the main engine is exactly specified, and the installation of the extension of the water pump wiring harness will cause the preheater to malfunction.
Pay attention to the loss of antifreeze during installation. It should be supplemented with antifreeze of the same specification after installation, and filled to the specified capacity after the engine has been cycled for a certain period of time.

Special Note
Each time the product is started, if it’s necessary to exhaust the air inside the pump, it is recommended to install the product in the following figure, which is conducive to the exhaust of the product and reduces the noise during startup; if the product does not need to be exhausted during startup, the product can be installed in any way.

Advantages of TOPSFLO car preheater water pump
1.Without starting the engine, the engine and the interior of the car can be preheated at the same time, allowing the car owner to open the door in the cold winter to enjoy the warmth like home, and solve the difficulties of defrosting the windows, shaving snow, and wiping fog.
2.The preheating is convenient and equipped with intelligent control, which can realize the advanced remote control and timing system to easily heat the car at any time, which is equivalent to having a car warmer.
3.The water cycle realizes environmental protection, efficient and quick start, and avoids the wear and tear of the engine caused by low temperature cold start. Research shows that the engine wear caused by a cold start is equivalent to the normal driving of the vehicle for 200 kilometers, and 60% of the engine wear is caused by the cold start. Installing a car engine preheater can fully protect the engine and prolong the service life of the engine by 30%.
4.The cumulative service life of TOPSFLO brushless dc circulation water pump is 5-10 times stronger than that of traditional brushed pumps. Once invested, you will benefit for a lifetime.
5.The structure is compact, easy to install and maintenance-free.

As a pump technology solution expert, TOPSFLO has been deeply involved in the micro pump industry for many years and has always strictly demanded itself with high international standards. TOPSFLO has been serving high-end automotive preheater manufacturers at home and abroad for a long time. It has rich experience in project matching and can provide professional&mature preheater water pump solutions. We look forward to working with more preheater manufacturers to jointly contribute to the innovation and development of the industry!

How to Choose a Car Preheater Circulation Pump Supplier

According to the research, the wear to the car engine caused by a cold start in a low temperature environment could be equivalent to the wear caused by the normal running for 200 kilometers, and nearly 60% of engine wear is from cold start. Under this situation, the emergence of car preheater has successfully solved this problem, and has been recognized by more and more people. So as the key component of the car preheater, car preheating circulating pump is absolutely quite important.

According to the data from CPCA, the cumulative national car sales in the first quarter of 2021 is 5.092 million, a year-on-year increase of 68.8%. The car preheater industry is ushering in a stage of rapid development, and there are more and more manufacturers of car preheating circulating pumps. However, the product quality of pumps is uneven, seriously affected the development of the car preheater industry. So how to choose a high-quality car preheating circulating pump supplier as a car preheater manufacturer? Let’s turn to the idea and thoughts shared by the Topsflo engineer who has been in deep ploughing car electronic pump industry for more than ten years.

Firstly, choose a car preheating circulating pump supplier with its own independent R&D and factory. Generally, these companies have a complete organizational structure, management, and service system. Therefore, they will have a strong guarantee on product quality, delivery time, custom development, etc.

Secondly, choose a supplier with stable cooperative relations with world-renowned car companies or key OEMs, as these well-known companies have their own strict and complete supplier review system. Therefore, these car preheater circulating pump suppliers who can be selected by major car manufacturers and could reach a long-term stable cooperative relationship with them, their comprehensive strength and product are definitely guaranteed.

Finally, choose a supplier who can provide customized services. As we all know, different vehicles and different application environments will have various requirements on pump’s material, parameters and process, so it’s quite vital to choose to pump suitable for given product. And the customized service can provide the best match for car preheaters.

In conclusion, I believe that you already have a certain understanding of how to choose a high-quality car preheater circulating pump supplier now. Only a well-chosen pump can improve the efficiency of the car preheater and help preheater to start easily in extreme environments, reducing the wear and tear. On the contrary, the use of inferior water pumps will not only fail to achieve the ideal preheating effect, but also will accelerate the wear of car engines and affect the brand power of car preheater companies.

As a leader in the domestic micro pump industry, TOPSFLO has been focused on R&D, manufacturing, and sales of micro water pumps for 16 years, and has long-term and stable cooperative relationships with many domestic and foreign car preheater manufacturers. What’s more, Topsflo is also one of the few companies in the domestic micro brushless DC pump industry that has obtained TüV Rheinland IATF 16949 & ISO 9001 certification. In addition, with high-quality products and excellent services, TOPSPLO has been always providing excellent pumps and preheater circulating pump solutions for high-standard car preheater customers, thus a high quality choice for car preheater suppliers.

What is the Automotive Electric Water Pump?

The car electric circulating water pump is a key component of automobile cooling system,usually a 12v or 24v electric coolant pump,such as TA50 and TA60 automotive car water pump series. The brushless motor drives the impeller to rotate, so that the pressure of the liquid is increased to circulate water and other liquids, and the coolant dissipates heat

Prospects
New energy vehicles are the main direction of the global automotive industry’s green development and low-carbon transformation, with huge development potential. automotive water pumps are the core component of the cooling system, and also have great prospects for development.
Because the performance and quality of the electronic circulation pump of the car have a great influence on the performance of the car. Automobile manufacturers will choose a convenient, stable performance, low energy consumption, high efficiency automotive electronic circulation pump.

TOPSFLO Automotive electric pump
Automotive electric coolant pump are mainly used for vehicle preheating system, car engine cooling circulation, hydrogen fuel cell heat management system, new energy vehicle drive system, electric vehicles battery cooling system. As well as cooling system of vehicle, motorcycle, new energy vehicles, hybrid buses, caravan, race car, street car etc.

TOPSFLO has maintain stable cooperation with leading domestic and foreign companies such as TESLA, KTM, BAIC, Dongfeng, and SAG so far. And with strong technical support, strict quality control, automated production capacity and stable high quality and high batch consistency, we have reached stable and long-term cooperative relations with many customers for more than 10 years. TOPSFLO warmly welcome more customers and friends to contact us, together to start a reliable journey. 

TOPSFLO Brushless DC Automotive Electronic Pump

–an alternative choice for Bosch PAD and 392 024 058 pumps

Based on original products, TOPSFLO has upgraded brushless DC car electronic water pump TA50 and TA60 series, and product raw materials, structure, quality and performance have been further improved, widely satisfied and praised by clients globally.

TOPSFLO has made the following improvements for the TA60 electric car water pump product performance improvement:

1, High efficiency ECM brushless DC motor; Durable permanent magnetic rotor & high density ceramic shaft
2, Advanced magnetic driving technology, static-seal without leakage forever
3, Replacing position sensor by micro processor position calculation, motor coreless control with much more intelligence and convenience(PWM speed control funciton available)
4, -40~125°C wide operating temperature is realized, suitable for extreme outdoor environment
5, Optimized 3 phase motor high efficiency design, combined with low-resistance copper wire, achieving large flow and low temperature rise.
6, Anti-vibration pump rubber bracket designed for automotive vibration working condition
7, Highly adaptable circuit designed specially for unstable automotive voltage and peak voltage
8, More protection functions

At present, more and more OEM customers look for TOPSFLO TA50 & TA60 to replace Bosch DC micro car circulation pump, not only because of its competitive prices, but also for its excellent performance and suitability. Specific parameters can be compared as follows:

TOPSFLO looks forward to establish cooperation with more clients. We have a strong R & D team which can achieve customized products, not only with experience and efficiency, but also giving you good satisfaction from aspects to bring a long term reliable cooperation.