Shutdown auxiliary cooling system of range extender engine

Abstract

The invention discloses a shutdown auxiliary cooling system for a range extender engine, relates to the technical field of engine cooling and lubrication, and solves the technical problem that main high-temperature parts of an engine cannot be cooled after a traditional engine is shut down, so that faults are easily caused. The system comprises an electronic water pump, a water inlet of the electronic water pump is connected with a water outlet of a thermostat, a water outlet of the electronic water pump is connected with a cooling water inlet of an air cylinder body, and a cooling water outlet of the air cylinder body is connected with a cooling water inlet of an air cylinder cover and a cooling water inlet of a supercharger. And the ECU obtains the working state of the engine, and when the engine is in the normal working state, the electronic water pump is closed. According to the engine cooling system, engine parts can be cooled after the engine is stopped, and the conditions that after the engine is stopped, the cylinder cover and a supercharger are subjected to heat regeneration, the temperature is too high, consequently, the cylinder cover cracks, and engine oil of the supercharger is coked and clamped are prevented.

Description

Technical Field

[0001] The invention relates to the field of engine cooling and lubrication, and more particularly to a shutdown auxiliary cooling system for a range extender engine. Background Art

[0002] In the traditional range extender engine cooling system, the cooling water pump is driven by the engine. The water outlet of the cooling water pump is connected to the cooling water inlet of the cylinder block, and the cooling water outlet of the cylinder block is respectively connected to the cooling water inlet of the cylinder head and the cooling water inlet of the supercharger. The cooling water outlet of the cylinder head is connected to the water inlet of the warm air system through the water outlet pipe, and the cooling water outlet of the supercharger is connected to the water inlet of the thermostat through the water outlet pipe. The first water outlet of the thermostat is connected to the water inlet of the cooling water pump through the engine small circulation pipe, and the second water outlet of the thermostat is connected to the water inlet of the radiator, and the water inlet of the radiator is connected to the water inlet of the cooling water pump. The water inlet of the cooling water pump is also connected to an expansion water tank for water replenishment.

[0003] The main function of the range extender engine cooling system is to prevent the engine from overheating and ensure that the temperature of engine components remains within the appropriate temperature range under all operating conditions. The cooling system keeps the engine within the normal temperature range by dissipating the heat of high-temperature parts into the coolant, thereby preventing damage and performance degradation caused by overheating. In addition, the cooling system can also heat up the engine as quickly as possible and maintain a constant temperature, which is very important for improving engine efficiency and reducing pollutant emissions.

[0004] However, due to the frequent start-stop characteristics of the range extender engine, the cooling water pump will stop immediately after the traditional engine stops, and it is impossible to cool the main high-temperature components of the engine (especially the cylinder head and supercharger) after the shutdown. The cylinder head is prone to local overheating and boiling under the effect of heat recovery, causing fatigue cracking; the supercharger is prone to oil coking under the effect of heat recovery, leading to jamming and other faults. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a shutdown auxiliary cooling system for a range extender engine in view of the deficiencies in the prior art, so as to solve the technical problem that the main high-temperature components of the traditional engine cannot be cooled after shutdown, which easily leads to failures.

[0006] The present invention discloses a shutdown auxiliary cooling system for a range extender engine, the system comprises an electronic water pump, the water inlet of the electronic water pump is connected to the water outlet of the thermostat, the water outlet of the electronic water pump is connected to the cooling water inlet of the cylinder body, the cooling water outlet of the cylinder body is respectively connected to the cooling water inlet of the cylinder head and the cooling water inlet of the supercharger;

[0007] The ECU obtains the working state of the engine, and when the engine is in a normal working state, turns off the electronic water pump; when the engine is in a shutdown state, starts the electronic water pump and triggers the working mode of the electronic water pump according to the power-on and power-off state of the ECU.

[0008] As a further improvement, when the ECU is in a power-off state, the working mode of the electronic water pump is a delayed operation mode;

[0009] When the ECU is in a powered-on state, the working mode of the electronic water pump is a normal speed regulation mode.

[0010] Furthermore, when the working mode of the electronic water pump is the delayed operation mode, the working speed of the electronic water pump is a preset standard speed, and the running time of the electronic water pump is a preset standard time.

[0011] Furthermore, when the working mode of the electronic water pump is the delayed operation mode, the delayed start time of the electronic water pump is 0.5-1.5S.

[0012] Furthermore, when the working mode of the electronic water pump is the normal speed regulation mode, the working speed and running time of the electronic water pump are obtained by calibration.

[0013] Furthermore, a one-way valve is installed in the pipe connecting the water outlet of the electronic water pump and the cylinder body.

[0014] Beneficial Effects

[0015] The advantages of the present invention are:

[0016] 1. The present invention obtains the working state of the engine by arranging an electronic water pump between the cylinder block and the thermostat. When the engine is in a normal working state, the electronic water pump is turned off; when the engine is in a shutdown state, the electronic water pump is started, and the working mode of the electronic water pump is triggered according to the power-on and power-off states of the ECU, thereby realizing cooling of the engine components even after the engine is shut down, and preventing the cylinder head and supercharger from being overheated after the engine is shut down, resulting in cracking of the cylinder head, coking and jamming of the supercharger oil, and other faults.

[0017] 2. The present invention prevents the coolant in the cylinder body from flowing back into the electronic water pump by installing a one-way valve in the pipeline between the water outlet of the electronic water pump and the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the control principle of the electronic water pump of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure principle of the auxiliary cooling system of the present invention;

[0020] Figure 3 It is a schematic diagram of the installation structure of the electronic water pump in the auxiliary cooling system of the present invention;

[0021] Figure 4 It is a schematic diagram of the installation structure of the one-way valve in the auxiliary cooling system of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0023] See also Figure 1-Figure 4 The present invention provides a shutdown auxiliary cooling system for a range extender engine. The shutdown auxiliary cooling system in this solution includes an electronic water pump. An electronic water pump is added for auxiliary cooling. The water inlet of the electronic water pump is connected to the water outlet of the thermostat of the engine. When the engine is shut down, the electronic water pump is started to pump the coolant into the cylinder block. The coolant flows into the cylinder head and the supercharger through the cylinder block, thereby cooling the cylinder head and the supercharger, thereby preventing the occurrence of faults such as cracking of the cylinder head and the coking and jamming of the supercharger oil due to overheating caused by the shutdown of the engine and the heat recovery of the cylinder head and the supercharger.

[0024] like Figure 1 As shown, the working state of the engine is obtained. When the engine is in a normal working state, the electronic water pump is turned off; when the engine is in a shutdown state, the electronic water pump is started and the working mode of the electronic water pump is triggered according to the power-on and power-off state of the ECU.

[0025] When the ECU is in the power-off state, the working mode of the electronic water pump is the delayed operation mode. When the working mode of the electronic water pump is the delayed operation mode, the working speed of the electronic water pump is the preset standard speed, and the running time of the electronic water pump is the preset standard time. The standard speed and standard time are set by the manufacturer of the electronic water pump when it leaves the factory. When the working mode of the electronic water pump is the delayed operation mode, the delayed start time of the electronic water pump is 1S.

[0026] When the ECU is powered on, the electronic water pump works in the normal speed regulation mode. When the electronic water pump works in the normal speed regulation mode, the working speed and running time of the electronic water pump are calibrated according to the actual vehicle status.

[0027] A one-way valve is installed in the pipe connecting the water outlet of the electronic water pump and the cylinder body. The one-way valve can prevent the coolant in the cylinder body from flowing back into the electronic water pump, thereby preventing damage to the electronic water pump.

[0028] This solution also provides a method for controlling the electronic water pump through the cylinder head temperature and the supercharger temperature: setting the cylinder head temperature threshold and the supercharger temperature threshold, when the engine is in a shutdown state, starting the electronic water pump and obtaining the cylinder head real-time temperature and the supercharger real-time temperature, when the cylinder head real-time temperature is greater than or equal to the cylinder head temperature threshold or the supercharger real-time temperature is greater than or equal to the supercharger temperature threshold, increasing the working speed of the electronic water pump to the rated speed, and the running time of the electronic water pump is calibrated by the actual vehicle state. The electronic water pump pumps the coolant into the cylinder body, and the coolant in the cylinder body then enters the cylinder head and the supercharger, so that the cylinder head real-time temperature is less than the cylinder head temperature threshold and the supercharger real-time temperature is less than the supercharger temperature threshold.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A shutdown auxiliary cooling system for a range extender engine, characterized in that: The system includes an electronic water pump, the water inlet of the electronic water pump is connected to the water outlet of the thermostat, the water outlet of the electronic water pump is connected to the cooling water inlet of the cylinder block, and the cooling water outlet of the cylinder block is respectively connected to the cooling water inlet of the cylinder head and the cooling water inlet of the supercharger; The ECU obtains the working state of the engine, and when the engine is in a normal working state, turns off the electronic water pump; when the engine is in a shutdown state, starts the electronic water pump and triggers the working mode of the electronic water pump according to the power-on and power-off state of the ECU.

2. A shutdown auxiliary cooling system for a range extender engine according to claim 1, characterized in that: When the ECU is in a power-off state, the working mode of the electronic water pump is a delayed operation mode; When the ECU is in a powered-on state, the working mode of the electronic water pump is a normal speed regulation mode.

3. A shutdown auxiliary cooling system for a range extender engine according to claim 2, characterized in that: When the working mode of the electronic water pump is the delayed operation mode, the working speed of the electronic water pump is a preset standard speed, and the running time of the electronic water pump is a preset standard time.

4. A shutdown auxiliary cooling system for a range extender engine according to claim 3, characterized in that: When the working mode of the electronic water pump is the delayed operation mode, the delayed start time of the electronic water pump is 0.5-1.5S.

5. The shutdown auxiliary cooling system of the range extender engine according to claim 2, characterized in that: When the working mode of the electronic water pump is the normal speed regulation mode, the working speed and the running time of the electronic water pump are obtained by calibration.

6. The shutdown auxiliary cooling system of the range extender engine according to claim 1, characterized in that: A one-way valve is installed in the pipeline connecting the water outlet of the electronic water pump and the cylinder body.

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