CN103114902A - Motor cooling water pump assembly and flow-quantity controlling method thereof - Google Patents

Abstract

The invention discloses an engine cooling water pump assembly and a flow control method thereof. The water pump assembly is provided with first and second rotary valves on the water pump housing, and the engine ECU passes the stepping motor according to the ambient temperature and engine working conditions. Control the opening of the first and second rotary valves to achieve rapid adjustment of the engine temperature. The ECU simultaneously records the rotation angle value of the stepping motor when the flow is adjusted in place, and replaces it with the corresponding control data stored in the ECU. Control data is updated in real time. The engine warm-up time of the invention is shorter, and excessive cooling of the engine at partial load can be avoided, and the temperature control of the engine is fast and accurate, so that the combustion of the engine is more sufficient, the emission of the engine is reduced, and the economic performance of the engine is improved.

Description

Engine cooling water pump assembly and flow control method thereof

technical field

The invention relates to an engine cooling water pump of an automobile, in particular to a water pump assembly which can automatically adjust the flow of engine cooling water according to the working conditions of the engine to control the temperature of the cooling water, and a corresponding flow control method. the

Background technique

Automobile engines have an optimal working temperature, at which temperature, the fit gap between various running parts is in the best state, at this time, the engine has high working efficiency, more complete combustion, and can minimize engine emissions . At present, the temperature control of automobile engines is usually realized by a wax-type thermostat with main and auxiliary valves. The thermostat controls the opening and closing of the main valve and the auxiliary valve at the same time. The main valve is used to control the large circulation channel of cooling water , while the auxiliary valve is used to control the small cooling water circulation channel. When the engine is started, the temperature of the engine cooling water is low. At this time, the main valve of the thermostat is closed, while the auxiliary valve is open. The engine cooling water goes through a small cycle, and the cooling water does not pass through the radiator. The engine is cooled, and the temperature of the engine can rise quickly to warm up the engine, so that the engine can enter a normal working state. When the engine is working normally, the temperature of the engine cooling water rises, and the paraffin wax in the thermostat melts and expands in the induction body, and then pushes the push rod in it to move axially. When the push rod moves, it drives the main valve of the thermostat to open. And correspondingly close the auxiliary valve. At this time, the engine cooling water goes through a large circulation to cool the engine, thereby reducing the engine temperature to ensure that it works within a reasonable temperature range.

For example, "a kind of thermostat" disclosed in the Chinese patent literature has an application publication number of CN102588067A, which includes a cover, a bracket, an ejection mechanism, and a main valve fixed on the ejection mechanism, an auxiliary valve and a sealing valve linked with it. The ejection mechanism is composed of a push rod, a main spring, and a columnar wax-type induction body. The columnar wax-type induction body is provided with an induction body base, an induction body upper cover, and a wax chamber is provided between the induction body base and the induction body upper cover. A rubber diaphragm is arranged between the push rod and the wax chamber; a rubber sealing ring is arranged between the upper cover of the induction body, the push rod and the rubber diaphragm. The thermostat uses temperature-sensitive wax as the power source, and uses the thermal expansion force of the wax to cause the axial deformation of the sealing rubber diaphragm, thereby pushing the valve to open and close.

However, there are following problems in controlling the engine temperature through the wax-type thermostat: since the temperature of the engine is indirectly controlled by controlling the temperature of the engine cooling water, the opening of the thermostat valve cannot be adjusted according to the actual working conditions of the engine. Precise control of the temperature of the engine cannot be achieved. The cooling water pump of automobile engine is designed according to the cooling performance required by the maximum heat load, so when the engine is running at low speed and low load, the engine is overcooled, and the response speed of the wax-type thermostat is slow, so that the engine Large fluctuations in water temperature are not conducive to the reduction of engine fuel consumption and emissions.

the

Contents of the invention

The purpose of the present invention is to solve the problems in the prior art that the temperature of the engine cannot be accurately controlled according to the actual working conditions of the engine and the large fluctuation of the engine water temperature, and to provide a system that can quickly and accurately control the engine according to the actual working conditions of the engine. The engine cooling water pump assembly and the corresponding flow control method, so that the engine can be warmed up quickly when the engine is hot, and the cooling effect of the engine at part load can be improved, so that the combustion of the engine can be more complete, the emission of the engine can be reduced, and the economy of the engine can be improved. performance.

In order to achieve the above object, the present invention adopts the following technical solutions:

An engine cooling water pump assembly, including a water pump housing, an impeller chamber is arranged at one end of the water pump housing, an impeller shaft is arranged in the impeller chamber, an impeller is fixed on the impeller shaft, and a driving wheel is fixed at one end of the impeller shaft extending out of the impeller chamber , the impeller chamber is provided with a water pump outlet on the radial side wall, and a rotatable outlet valve core is arranged in the water outlet of the water pump, thus forming a first rotary valve. Axially arranged cylindrical water inlet valve chambers, a first water inlet is provided on the side wall of the water inlet valve chamber, a rotatable water inlet valve core is arranged in the water inlet valve chamber, and the water inlet valve chamber and the water inlet valve core Constitute the second rotary valve, the water inlet valve core is provided with a water inlet channel extending along the axial direction of the water inlet valve chamber and communicating with the impeller chamber, and the water inlet valve core is provided with a water inlet corresponding to the position of the first water inlet in the axial direction The first water inlet hole communicated with the water inlet channel; the water pump casing is also provided with a control motor, and the control motor is respectively associated with the water inlet valve core and the water outlet valve core through the transmission system.

When the present invention is used for engine temperature control, the existing paraffin type thermostat can be omitted, the water pump outlet is connected with the water inlet of the engine water jacket, and the first water inlet is connected with the water outlet of the radiator, thus , the first rotary valve on the water pump assembly can be used to control the water output from the water pump to the engine water jacket, while the second rotary valve is used to control the cooling water cooled by the radiator into the water pump. In the present invention, the engine temperature is no longer controlled solely according to the cooling water temperature, but the ECU of the engine performs rapid control on the control motor according to the actual operating conditions of the engine (speed, load, etc.), engine cooling water temperature, ambient temperature, etc., and then controls The opening and closing of two rotary valves makes the engine work at the optimum temperature. Compared with the existing paraffin-type thermostat, the speed of temperature regulation is faster, especially it can be regulated according to the actual operating conditions of the engine, so as to avoid excessive cooling of the engine when the engine is running at low speed and low load, thereby The combustion of the engine is more complete, which is beneficial to reduce the emission of the engine and improve the economic performance of the engine. When the engine is just started, the first and second rotary valves are all closed. At this time, the cooling water inside the engine is completely closed and does not flow. The cooling water circulates in the water pump, so the whole engine can realize warm up.

Preferably, a second water inlet is provided on the side wall of the water inlet valve cavity, and a second water inlet hole communicating with the water inlet channel is provided on the water inlet valve core corresponding to the second water inlet. The second water inlet is used to connect with the water outlet of the oil cooler, so that the second rotary valve formed by the water inlet spool and the water inlet valve cavity can control two channels at the same time, when the control motor controls the rotation of the water inlet spool to When adjusting the cooling water flow of the engine, the cooling water flow through the oil cooler can be adjusted at the same time to control the heat dissipation of the oil cooler.

As a preference, the outer wall of the water inlet valve core has arc-shaped shoulders corresponding to the first and second water inlets in the axial direction, and the water inlet valve chamber has arc-shaped shoulders at the first and second water inlets respectively. Curved recesses for matching shoulders. Two arc-shaped shoulders are arranged on the water inlet valve core, and the arc-shaped shoulders are convex arcs on the longitudinal section, so that the entire water inlet valve core is gourd-shaped. In this way, the inlet of the water inlet channel is provided inside. The water valve core has higher compressive strength at the first and second water inlets, which is conducive to improving the sealing performance between the water inlet valve core and the water inlet valve cavity, and can reduce the wall thickness of the water inlet valve core. Conducive to weight reduction and processing and manufacturing. In addition, the overall gourd-shaped water inlet spool can greatly reduce the contact area with the water inlet valve cavity, thereby reducing the frictional resistance when the water inlet spool rotates, which in turn facilitates the control of the motor on the water inlet spool.

As a preference, the water inlet channel of the water inlet valve core is provided with a valve stem support seat, and the center of the valve stem support seat is provided with a support hole with a spline groove; a water inlet valve stem is inserted into the support hole, and the water inlet valve The rod is provided with a spline adapted to the spline groove of the supporting hole. The end of the water inlet valve rod away from the impeller chamber is connected to a turbine, and the rotating shaft of the control motor is provided with a worm meshing with the turbine; the inlet valve core is provided at the end close to the impeller chamber. There is a driving gear, and the valve stem of the water outlet valve core is provided with a driven gear meshed with the driving gear.

The invention uses the worm gear to drive the control motor to drive the water inlet valve core to rotate, and at the same time, the water inlet valve core synchronously controls the opening and closing of the first rotary valve through the driving gear and the driven gear, thereby facilitating the opening and closing of the first and second rotary valves time fit. Since the water inlet spool acts as a transmission shaft at the same time, it is beneficial to simplify the structure of the entire transmission system, and the worm gear has a large transmission ratio, which can greatly reduce the error of controlling the rotation of the motor to the rotation of the water inlet spool. The influence of the angle is beneficial to improve the control accuracy of the two rotary valves and reduce the accuracy requirements for the control motor.

As a preference, the impeller cavity is also provided with a water return pipe on the radial side wall, and the water inlet valve core is also provided with a water return hole at the arc-shaped shoulder where the first water inlet hole is provided. A water return port is correspondingly provided on the side wall, and the water return pipe communicates with the water return port. The water return pipe, the water return port and the water return hole form a self-circulation channel of the water pump, so that the first rotary valve formed by the water inlet valve core and the water inlet valve cavity can control three channels at the same time. When the engine is working normally, the first and second rotary valves are opened, and the self-circulation channel is cut off, and the cooling water goes through a large circulation; when the engine starts to warm up, the first and second rotary valves are closed simultaneously, the self-circulation channel is opened, and the water pump The cooling water inside can be self-circulating through the self-circulation channel, thus helping to reduce the load of the water pump during self-circulation.

Preferably, the first water inlet holes are laterally arranged isosceles triangles. In this way, when the water inlet spool increases the same rotation angle, the corresponding water inlet cross-sectional area increases linearly, so when the engine temperature just exceeds the optimum temperature value, the cooling water flow increase value is small, If the temperature of the engine exceeds the optimal temperature value by a large amount, the water inlet valve core will increase by the same rotation angle and the flow rate of cooling water will increase greatly. precise control.

A flow control method for an engine cooling water pump assembly based on claim 1, comprising the following steps:

a. Set the minimum unit value of the engine temperature change and the minimum rotation angle when the water outlet valve core and the water inlet valve core rotate. Compare with the optimum value of working temperature;

b. When the engine is just started, the engine temperature is lower than the optimal value of the engine operating temperature, the ECU controls the first and second rotary valves to close, and the water pump performs self-circulation to achieve rapid engine warm-up:

c. When the engine temperature rises to at least one minimum unit value exceeding the preset optimal operating temperature, the ECU sends a corresponding command to the control motor to rotate an angle according to the ambient temperature, engine operating conditions and pre-stored control data , and through the transmission system, the water outlet valve core and the water inlet valve core are rotated at a corresponding angle in a positive direction. At this time, the first and second rotary valves open a corresponding opening, and the cooling water corresponding to the flow rate starts to circulate to take away the excess heat;

d. When the absolute value of the difference between the engine temperature data collected by the engine ECU and the optimum value is less than a minimum unit value, the ECU controls the opening of the first and second rotary valves to remain unchanged. If the engine When the difference between the temperature data and the optimal value is a positive value and the absolute value is greater than a minimum unit value, the ECU controls the motor to rotate so that the water outlet valve core and the water inlet valve core rotate positively for a minimum rotation angle, if the engine When the difference between the temperature data and the optimal value is a negative value and the absolute value is greater than a minimum unit value, the ECU controls the motor to rotate so that the water outlet spool and the water inlet spool reversely rotate a minimum rotation angle, so that By analogy, until the absolute value of the difference between the engine temperature data and the optimal value is less than a minimum unit value.

In the flow control method of the present invention, the control mode of the prior art through the paraffin-type thermostat is replaced by electronic control, and the control data stored in advance by the ECU includes the ambient temperature, the operating conditions of the engine and the corresponding control motor rotation angle. When the temperature of the engine exceeds the optimal value, the ECU can quickly control the opening of the first and second rotary valves according to the control data, so that the temperature of the engine can be adjusted quickly, and the starting function can be kept in the best working state. In particular, after the ECU controls the opening degrees of the first and second rotary valves according to the control data, it can continue to collect the temperature data information of the engine, and correspondingly make the water outlet valve core and the water inlet valve core rotate a minimum rotation angle, so that Make fine adjustments to the temperature of the engine to keep it at the optimum operating temperature.

Preferably, in step d, when the absolute value of the difference between the engine temperature data collected by the ECU and the optimum value is less than a minimum unit value, record the total rotation angle value of the control motor at this time, and replace it In the pre-stored control data, the rotation angle value of the control motor corresponds to the ambient temperature and the operating condition of the engine at this time.

Since the pre-stored control data in the ECU will inevitably have errors when controlling the temperature of the engine, the present invention stores the control data when the car is actually running in the ECU and replaces the original control data, so that the control data is more in line with the temperature of the car. Actual operating conditions, especially, with the increase of vehicle mileage, the radiator performance of the engine, etc. will change, but the above-mentioned control data of the present invention is updated in real time, thereby making the flow adjustment process of cooling water faster and ensuring The engine always works in the optimum temperature range.

In summary, the present invention has the following beneficial effects: engine warm-up time is shorter, excessive cooling of the engine at partial load is avoided, the temperature control of the engine is fast and accurate, so that the combustion of the engine is more complete, and the emission of the engine is reduced. Improve the economic performance of the engine.

the

Description of drawings

Fig. 1 is a schematic structural view of the engine cooling water pump assembly of the present invention.

Fig. 2 is a schematic structural view of the engine cooling water pump assembly of the present invention after removing the water pump housing.

In the figure: 1. Water pump housing 2. Impeller chamber 21. Impeller shaft 22. Impeller 23. Driving wheel 24. Water outlet valve core 25. Water pump outlet 3. Water inlet valve chamber 31. First water inlet 32. Second inlet Water outlet 4, water inlet valve core 41, arc-shaped shoulder 42, first water inlet hole 43, second water inlet hole 44, return water hole 5, control motor 61, turbine 62, worm 63, driving gear 64, driven Gear 65, idler

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

The engine cooling water pump assembly flow control method of the present invention adopts the engine cooling water pump assembly shown in Figure 1 and Figure 2, the engine cooling water pump assembly includes a water pump housing 1, and the impeller chambers are arranged side by side in the water pump housing 2 and the cylindrical water inlet valve cavity 3, the impeller shaft 21 is arranged in the impeller cavity at one end of the water pump housing, the impeller 22 is fixed on the impeller shaft, and one end of the impeller shaft extends out of the impeller cavity and is fixed at the protruding end Drive wheel 23 is arranged, and this drive wheel is mainly driven by engine, also can be driven by motor, and impeller cavity is provided with water pump water outlet 25 on the radial side wall, and rotatable water outlet valve core 24 is set in the water pump water outlet, and water outlet valve core is The spherical shape is provided with corresponding through-holes, thereby constituting the first rotary valve.

The water inlet valve cavity is arranged along the axial direction of the impeller cavity, and is arranged coaxially with the impeller cavity. On the side wall of the water inlet valve cavity, a first water inlet 31 and a second water inlet 32 are arranged on the side wall of the water inlet valve cavity. A rotatable water inlet valve core 4 is correspondingly arranged inside, and the water inlet valve cavity and the water inlet valve core constitute a second rotary valve. The water inlet valve core is generally a thin shell member, and its interior is a water inlet passage extending along the axial direction of the water inlet valve chamber and communicating with the impeller chamber. The water inlet valve core corresponds to the first and second water inlets in the axial direction A first water inlet hole 42 and a second water inlet hole 43 communicated with the water inlet channel are respectively arranged at the positions, and the first and second water inlet holes are both horizontally arranged isosceles triangles.

In order to increase the compressive strength of the water inlet valve core and enhance its sealing performance, the outer wall of the water inlet valve core has arc-shaped shoulders 41 corresponding to the first and second water inlet holes in the axial direction, so that the water inlet The valve core is in the shape of a gourd as a whole. Correspondingly, the water inlet valve cavity has arc-shaped depressions adapted to the arc-shaped shoulders at the first and second water inlets respectively. Of course, for the convenience of processing and manufacturing, rubber joints can be provided at the first and second water inlets, water inlet through holes are provided on the rubber joints, and arc-shaped depressions are arranged at the inner side to match the arc-shaped shoulders of the water inlet valve core. fit.

The impeller chamber is also provided with a water return pipe (not shown in the figure) on the radial side wall, and the water inlet valve core is provided with a water return hole 44 at the arc shoulder of the first water inlet hole, and the water inlet valve chamber A water return port (not shown in the figure) is set on the side wall correspondingly, and the water return pipe communicates with the water return port, thereby forming a self-circulation channel of a water pump.

In addition, a valve stem support seat (not shown in the figure) is provided in the water inlet channel of the water inlet valve core, and a support hole with a spline groove is provided in the center of the valve stem support seat, and the support hole is coaxial with the water inlet valve core. The water inlet valve stem is plugged into the support hole, and the water inlet valve stem is provided with a spline adapted to the spline groove of the support hole, thereby forming a spline connection with the support hole to transmit torque. The end of the water inlet valve rod far away from the impeller chamber is splined with a turbine 61, a control motor 5 fixed in the water pump housing, and a worm 62 meshing with the turbine is arranged on its rotating shaft, so that the control motor can be controlled by the worm gear transmission system. Rotation of the water inlet spool. The control motor is preferably a stepper motor or a servo motor, so as to realize precise control of the rotation angle.

Further, the water inlet valve core is provided with a driving gear 63 near the end of the impeller chamber, the valve stem of the water outlet valve core is parallel to the axial direction of the water inlet valve core, and the driven gear 64 meshing with the driving gear is arranged on the valve stem of the water outlet valve core. In this way, the opening and closing of the first rotary valve can be synchronously controlled when the motor controls the opening and closing of the second rotary valve. Of course, an idler gear 65 can also be arranged between the driving gear and the driven gear, so as to facilitate the arrangement of the structure and reduce the overall size of the gear. Of course, the driving gear can also be arranged on the water inlet valve rod, and corresponding water holes are set on the driving gear at the same time, so that the water inlet channel of the water inlet valve core is kept in communication with the impeller cavity.

When the cooling water pump assembly of the present invention is in use, the water outlet of the water pump is connected with the water inlet of the engine water jacket, the first water inlet is connected with the water outlet of the radiator, and the second water inlet is connected with the water outlet of the oil cooler In this way, the first rotary valve on the water pump assembly can be used to control the water output from the water pump to the engine water jacket, while the second rotary valve is used to control the cooling water cooled by the radiator into the water pump, and at the same time regulate the cooling water through the engine oil. The cooling water flow of the radiator is used to control the heat dissipation of the oil cooler, and the water outlet of the engine water jacket is connected with the water inlet of the radiator and the water inlet of the oil cooler at the same time. In addition, it is necessary to set up corresponding temperature sensors to collect data such as ambient temperature, engine temperature, and cooling water temperature, and set the minimum unit value of engine temperature change and the time when the water outlet valve core and water inlet valve core rotate according to the requirements of control accuracy. The minimum rotation angle, the ECU of the engine continuously collects the engine temperature data repeatedly according to the preset interval time, and compares it with the preset optimal value of the engine operating temperature. The specific interval time can be determined according to the requirements of control accuracy. Preferably 2-4 minutes, preferably 3 minutes.

When the engine is just started, the engine temperature is lower than the optimum value of the engine working temperature, the ECU controls the first and second rotary valves to be completely closed, and the cooling water of the water pump flows through the self-circulation channel formed by the return pipe, the return port and the return hole. Self-circulation, the cooling water inside the engine is completely closed and does not flow, so as to realize the rapid warm-up of the engine.

When the engine temperature rises to at least one minimum unit value exceeding the preset optimum operating temperature, the ECU sends a corresponding command to the control motor to rotate an angle according to the ambient temperature, engine operating conditions and pre-stored control data, and Through the transmission system, the water outlet valve core and the water inlet valve core are positively rotated by a corresponding angle. At this time, the first and second rotary valves open a corresponding opening, and the cooling water of the corresponding flow rate starts to circulate to remove excess heat.

When the absolute value of the difference between the engine temperature data collected by the engine ECU and the optimum value is less than a minimum unit value (indicating that the aforementioned adjustments have made the engine work at the optimum operating temperature), the ECU controls the first , The opening of the second rotary valve remains unchanged, so that the original flow of cooling water remains unchanged; if the difference between the engine temperature data and the optimum value is positive and the absolute value is greater than a minimum unit value, At this time, the engine temperature still exceeds the optimum value, then the ECU controls the rotation of the motor to make the water outlet valve core and the water inlet valve core rotate positively for a minimum rotation angle, so that the opening of the first and second rotary valves becomes larger, thereby Increase the flow of cooling water to increase the cooling effect on the engine; if the difference between the engine temperature data and the optimal value is negative and the absolute value is greater than a minimum unit value, the engine temperature at this time is lower than the optimal value. value, then the ECU controls the rotation of the motor to make the water outlet valve core and the water inlet valve core reversely rotate a minimum rotation angle, so that the opening of the first and second rotary valves becomes smaller, thereby reducing the flow of cooling water and making the engine Can work at the best working temperature. By analogy, the ECU continuously adjusts the opening of the first and second rotary valves until the absolute value of the difference between the engine temperature data and the optimum value is less than a minimum unit value, so as to ensure that the engine works at its optimum temperature.

In addition, when the absolute value of the difference between the engine temperature data collected by the ECU and the optimal value is less than a minimum unit value, we can make the ECU record the total rotation angle value of the control motor at this time and replace it with the pre-stored In the control data corresponding to the ambient temperature and engine operating conditions at this time, the control motor rotation angle value, so that the control data is constantly updated in real time, making it more in line with the actual operation of the car, so that the cooling water flow adjustment process is more accurate Quick and easy to ensure that the engine always works in the optimum temperature range.

It should be noted that the total rotation angle value here refers to the rotation angle of the control motor that deviates from the origin after several adjustments.

Furthermore, we can also add an electronic water pump between the water outlet of the engine water jacket and the water inlet of the oil cooler, so that when the engine is stopped, the electronic water pump can continue to pump cooling water and heat the heat to the radiator discharge.

Claims (8)

1. An engine cooling water pump assembly, including a water pump housing (1), one end of the water pump housing is provided with an impeller chamber (2), an impeller shaft (21) is arranged in the impeller chamber, and an impeller (22) is fixed on the impeller shaft The drive wheel (23) is fixed on the end of the impeller shaft protruding from the impeller cavity, and the feature is that the impeller cavity is provided with a water pump outlet (25) on the radial side wall, and a rotatable water pump outlet is provided in the water pump outlet. The water outlet valve core (24) constitutes the first rotary valve. The water pump housing is also provided with a cylindrical water inlet valve chamber (3) that is axially aligned with the impeller chamber. The side wall of the water inlet valve chamber is provided with There is a first water inlet (31), and a rotatable water inlet valve core (4) is arranged in the water inlet valve cavity, and the water inlet valve cavity and the water inlet valve core form a second rotary valve, and the water inlet valve core is provided with There is a water inlet passage extending along the axial direction of the water inlet valve chamber and communicating with the impeller chamber, and the water inlet valve core is provided with a first water inlet hole (42) in the axial direction corresponding to the first water inlet position to communicate with the water inlet passage A control motor (5) is also provided in the water pump casing, and the control motor is respectively associated with the water inlet valve core and the water outlet valve core through the transmission system. 2. The engine cooling water pump assembly according to claim 1, characterized in that a second water inlet (32) is provided on the side wall of the water inlet valve chamber, and the water inlet valve core corresponds to the second water inlet. The position of the water inlet is provided with a second water inlet hole (43) communicated with the water inlet channel. 3. The engine cooling water pump assembly according to claim 2, wherein the outer wall of the water inlet valve core has arc-shaped shoulders in the axial direction corresponding to the first and second water inlet holes (41), the water inlet valve cavity has arc-shaped depressions adapted to the arc-shaped shoulders at the first and second water inlets respectively. 4. An engine cooling water pump assembly according to claim 1, 2 or 3, wherein a valve stem support seat is provided in the water inlet channel of the water inlet valve core, and the center of the valve stem support seat is arranged A support hole with a spline groove; a water inlet valve stem is plugged into the support hole, and a spline matching the spline groove of the support hole is provided on the water inlet valve stem, and a turbine ( 61), the rotating shaft of the control motor is provided with a worm (62) meshing with the turbine; the water inlet valve core is provided with a driving gear (63) at the end close to the impeller chamber, and the valve stem of the water outlet valve core is provided with a slave gear meshing with the driving gear Drive gear (64). 5. A kind of engine cooling water pump assembly according to claim 3, it is characterized in that, said impeller cavity is also provided with return pipe on the radial side wall, and the water inlet valve core is provided with the first water inlet hole A water return hole (44) is also provided at the arc-shaped shoulder of the water inlet valve chamber, and a water return port is correspondingly provided on the side wall of the water inlet valve cavity, and the water return pipe communicates with the water return port. 6. The engine cooling water pump assembly according to claim 1, 2 or 3, wherein the first water inlet hole is an isosceles triangle arranged laterally. 7. A flow control method for an engine cooling water pump assembly based on claim 1, characterized in that, comprising the steps of: a. Set the minimum unit value of the engine temperature change and the minimum rotation angle when the water outlet valve core and the water inlet valve core rotate. Compare with the optimum value of working temperature; b. When the engine is just started, the engine temperature is lower than the optimal value of the engine operating temperature, the ECU controls the first and second rotary valves to close, and the water pump performs self-circulation to achieve rapid engine warm-up: c. When the engine temperature rises to at least one minimum unit value exceeding the preset optimal operating temperature, the ECU sends a corresponding command to the control motor to rotate an angle according to the ambient temperature, engine operating conditions and pre-stored control data , and through the transmission system, the water outlet valve core and the water inlet valve core are rotated at a corresponding angle in a positive direction. At this time, the first and second rotary valves open a corresponding opening, and the cooling water corresponding to the flow rate starts to circulate to take away the excess heat; d. When the absolute value of the difference between the engine temperature data collected by the engine ECU and the optimum value is less than a minimum unit value, the ECU controls the opening of the first and second rotary valves to remain unchanged. If the engine When the difference between the temperature data and the optimal value is a positive value and the absolute value is greater than a minimum unit value, the ECU controls the motor to rotate so that the water outlet valve core and the water inlet valve core rotate positively for a minimum rotation angle, if the engine When the difference between the temperature data and the optimal value is a negative value and the absolute value is greater than a minimum unit value, the ECU controls the motor to rotate so that the water outlet spool and the water inlet spool reversely rotate a minimum rotation angle, so that By analogy, until the absolute value of the difference between the engine temperature data and the optimal value is less than a minimum unit value. 8. The engine cooling water pump assembly flow control method according to claim 7, characterized in that, in step d, when the absolute value of the difference between the engine temperature data collected by the ECU and the optimum value is less than a minimum When it is a unit value, record the total rotation angle value of the control motor at this time, and replace it with the control motor rotation angle value corresponding to the ambient temperature and engine operating conditions in the pre-stored control data at this time.

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