Device for range extender engine auxiliary cooling system

Abstract

The utility model relates to the field of hybrid electric vehicles, in particular to a device for an auxiliary cooling system of a range extender engine, which comprises an auxiliary water pump, a kettle and a sprayer. A cooling system of the range extender comprises a main water pump, a radiator, cooling liquid and a cooling fan. The control method comprises the steps that the temperature of cooling liquid of the range extender engine is obtained; whether the water temperature of the cooling liquid is higher than a first temperature threshold value or not is judged, when it is determined that the water temperature of the cooling liquid is higher than the first temperature threshold value, an auxiliary water pump and an atomization nozzle in the auxiliary cooling system are controlled to start working, and the temperature of the cooling liquid is reduced. According to the device for the range extender engine auxiliary cooling system, normal operation of the engine cooling system is guaranteed during in-situ parking and shutdown, the endurance time of an automobile can be greatly prolonged, losses caused by overheating of an engine of the automobile can be greatly reduced, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of hybrid electric vehicles, in particular to a device for an auxiliary cooling system of a range extender engine. Background Art

[0002] Compared to traditional vehicles, hybrid vehicles fully leverage the greatest advantages of the electric / thermal system, significantly reducing fuel consumption and pollutant emissions. Extended-range electric vehicles (EVs) have been proven to effectively reduce vehicle exhaust emissions and energy consumption, while also addressing the range anxiety of pure electric vehicles, making them the mainstream solution for future new energy vehicles. However, compared to traditional fuel vehicles, EV range extenders require the engine to operate at high power for extended periods of time, even in high-temperature environments. If a fully loaded vehicle is traveling uphill, the range extender operates at full power. While meeting the power requirements for the climb, the reduced speed increases the temperature of the air used by the engine cooling system, further compromising cooling efficiency and causing abnormally high engine temperatures.

[0003] If the vehicle arrives at the destination at this time and needs to stop on the spot, the range extender will be required to shut down by the range extender cooling control device. At this time, the engine coolant temperature is high, and the coolant cannot circulate after the shutdown. The high temperature in the engine cylinder continues, causing the coolant to vaporize, the vehicle expansion tank to overflow, and the components in the engine cylinder to be damaged by high temperature. Utility Model Content

[0004] The purpose of the embodiment of the present utility model is to provide a device for an auxiliary cooling system of a range extender engine. In the range extender cooling system of the prior art, in the case where the water temperature of the range extender is too high during operation but the range extender needs to be parked on the spot, a fan is mainly used to cool the range extender through air cooling, or the range extender enters an idle state to reduce the coolant temperature, but the cooling effect is poor, and the power consumption of the idle state is far greater than that of the auxiliary water pump.

[0005] The embodiment of the present utility model is implemented as follows: a device for an auxiliary cooling system of a range extender engine, comprising: obtaining the coolant water temperature of the range extender and the range extender operating condition, wherein the range extender operating condition includes a shutdown operating condition and an operating operating condition; collecting real-time numerical values ​​of the range extender engine cooling system; if the water temperature judgment result is a fourth temperature, operating the auxiliary water pump at full power and the nozzle starting to work frequently to reduce the coolant water temperature to a third temperature; if the water temperature judgment result is the third temperature, operating the auxiliary water pump at full power and the nozzle starting to work periodically to reduce the coolant water temperature to a second temperature; if the water temperature judgment result is the second temperature, operating the auxiliary water pump in an assisting manner according to a calculated target water flow rate, not operating the nozzle, and reducing the coolant water temperature to the first temperature.

[0006] Based on the coolant water temperature, if the coolant water temperature is higher than the preset first temperature threshold, the water temperature judgment result is the first temperature; if the coolant water temperature is within the preset second temperature threshold range, the water temperature judgment result is the second temperature; if the coolant water temperature is within the preset third temperature threshold range, the water temperature judgment result is the third temperature; if the coolant water temperature is within the preset fourth temperature threshold range, the water temperature judgment result is the fourth temperature; wherein, the first temperature is lower than the second temperature, the second temperature is lower than the third temperature; and the third temperature is lower than the fourth temperature.

[0007] When the cooling system is at the fourth temperature, the range extender is in the operating condition, the coolant temperature is at the fourth temperature, and does not reach the third temperature within a certain period of time, the system will limit the power generation of the range extender to reduce the coolant temperature.

[0008] When the cooling system is at the fourth, third, and second temperatures, and when the range extender is in a shutdown state, the coolant temperature is sequentially lowered to the first temperature to achieve continuous and efficient heat dissipation of the engine when the engine is stopped.

[0009] Determine the target water flow rate of the coolant water temperature corresponding to the system heat dissipation, the water flow rate corresponding to different speeds of the engine's main water pump, and the actual water flow rate of the water pump corresponding to different duty cycles. The auxiliary water pump is calculated according to the target water flow rate = the target water flow rate of the system heat dissipation - the water flow rate corresponding to different speeds of the main water pump.

[0010] The auxiliary cooling system device includes: a kettle, which guides air-conditioning water to the kettle through a pipeline so that the kettle is used to hold air-conditioning water, and a limit switch is installed on the kettle; a main water pump and a cooling radiator, the main water pump is used to send the coolant in the engine body to the cooling radiator when the range extender is started; an auxiliary water pump is used to send the coolant in the engine body to the cooling radiator when the range extender has a power generation demand, so as to ensure that when the engine is not started, there is still sufficient cooling water flow to dissipate heat in time at a low speed for the engine.

[0011] Preferably, the range extender is composed of an engine and a generator, and is started, operates to generate electricity, and stopped according to commands sent by the range extender cooling control device; during the operation of the range extender, the main water pump of the engine will make the coolant in the water pipe flow through a mechanical structure, and the higher the speed, the greater the cooling water flow.

[0012] Preferably, the kettle and the limit switch are such that when the water level is lower than the minimum liquid level, the limit switch is turned on. After the range extender cooling control device receives the signal, the nozzle is prohibited from working and a low water level prompt is displayed, which can prevent the water level in the kettle from being too low and prevent the nozzle from idling.

[0013] Preferably, when the coolant temperature is within a preset first temperature threshold range, the range extender's own cooling system is used to dissipate heat, and the auxiliary cooling system is not involved.

[0014] Preferably, when the coolant temperature is within a preset second temperature threshold range, the cooling system of the range extender itself participates in heat dissipation, and the auxiliary cooling system assists the range extender in always maintaining sufficient cooling water flow to dissipate heat for the engine in a timely manner.

[0015] Preferably, it also includes: a kettle and a nozzle, the kettle and the nozzle are connected by a water pipe, and the nozzle is fixedly connected to a position where water can be sprayed on the radiator of the engine. The water in the kettle is sprayed by the nozzle on the surface of the radiator of the engine, and begins to evaporate under the high temperature of the radiator of the engine, taking away a large amount of heat during evaporation. Therefore, the coolant after passing through the radiator is quickly cooled down and flows back to the engine to take away more heat.

[0016] A range extender cooling control device, comprising: a storage module, a control module, an acquisition module, and a program stored on the memory for implementing the range extender cooling control method; the storage module is used to store the program for implementing the range extender cooling control method, and the storage module stores the program for implementing the range extender cooling control method; the acquisition module is used to acquire real-time numerical values ​​of the range extender engine cooling system; and the control module is used to execute the program for implementing the range extender cooling control method.

[0017] The device for the auxiliary cooling system of the range extender engine provided by the utility model ensures that the engine cooling system operates normally when the vehicle is parked or stopped, which can greatly increase the vehicle's cruising time and greatly reduce the loss of the vehicle caused by engine overheating, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of a control method for an auxiliary cooling system of a range extender engine.

[0019] Figure 2 Schematic diagram of the device used for the auxiliary cooling system of the range extender engine.

[0020] Figure 3 Schematic diagram of the range extender operation for the range extender engine auxiliary cooling system.

[0021] In the attached figure: 10-generator, 20-engine, 30-main water pump, 40-radiator, 50-cooling fan, 60-auxiliary water pump, 70-kettle, 80-limit switch, 90-sprinkler, 210-storage module, 220-acquisition module, 230-control module. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.

[0023] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0024] See also Figure 1-Figure 3 The present invention provides a device for an auxiliary cooling system of a range extender engine, the device for an auxiliary cooling system of a range extender engine comprising:

[0025] Obtain the coolant temperature of the range extender and the range extender operating condition, wherein the range extender operating condition includes a shutdown condition and an operating condition; collect real-time values ​​of the range extender engine cooling system; if the water temperature judgment result is the fourth temperature, operate the auxiliary water pump 60 at full power and the nozzle 90 starts to work frequently to reduce the coolant temperature to the third temperature; if the water temperature judgment result is the third temperature, operate the auxiliary water pump 60 at full power and the nozzle 90 starts to work periodically to reduce the coolant temperature to the second temperature; if the water temperature judgment result is the second temperature, operate the auxiliary water pump 60 according to the calculated target water flow rate, do not operate the nozzle 90, and reduce the coolant temperature to the first temperature.

[0026] Based on the coolant water temperature, if the coolant water temperature is higher than the preset first temperature threshold, the water temperature judgment result is the first temperature; if the coolant water temperature is within the preset second temperature threshold range, the water temperature judgment result is the second temperature; if the coolant water temperature is within the preset third temperature threshold range, the water temperature judgment result is the third temperature; if the coolant water temperature is within the preset fourth temperature threshold range, the water temperature judgment result is the fourth temperature; wherein, the first temperature is lower than the second temperature, the second temperature is lower than the third temperature; and the third temperature is lower than the fourth temperature.

[0027] When the cooling system is at the fourth temperature, the range extender is in the operating condition, the coolant temperature is at the fourth temperature, and does not reach the third temperature within a certain period of time, the system will limit the power generation of the range extender to reduce the coolant temperature.

[0028] When the cooling system is at the fourth, third, and second temperatures, and when the range extender is in a shutdown state, the coolant temperature is sequentially lowered to the first temperature to achieve continuous and efficient heat dissipation of the engine 20 when the range extender is in a shutdown state.

[0029] Determine the target water flow rate of the coolant water temperature corresponding to the system heat dissipation, the water flow rate corresponding to different speeds of the main water pump 30 of the engine 20, and the actual water flow rate of the water pump corresponding to different duty cycles. The auxiliary water pump 60 is calculated according to the target water flow rate = the target water flow rate of the system heat dissipation - the water flow rate corresponding to different speeds of the main water pump 30.

[0030] The auxiliary cooling system device includes: a kettle 70, which guides air-conditioning water to the kettle 70 through a pipeline so that the kettle 70 is used to hold air-conditioning water. At the same time, a limit switch 80 is installed on the kettle 70; a main water pump 30 and a cooling radiator 40. The main water pump 30 is used to deliver the coolant in the engine 20 to the cooling radiator 40 when the range extender is started; an auxiliary water pump 60 is used to deliver the coolant in the engine 20 to the cooling radiator 40 when the range extender has a power generation demand, so as to ensure that when the engine 20 is not started, there is still sufficient cooling water flow to dissipate heat from the engine 20 in time at a low speed.

[0031] The range extender consists of an engine 20 and a generator 10. It starts, generates electricity, and stops according to commands sent by the range extender's cooling control device. During operation, the engine 20's built-in main water pump 30 mechanically circulates the coolant in the water pipes. Higher speeds increase the cooling water flow rate.

[0032] The kettle 70 and the limit switch 80, when the water level is lower than the minimum liquid level, the limit switch 80 is turned on. After receiving the signal, the range extender cooling control device prohibits the nozzle 90 from working and displays a low water level prompt, which can prevent the water level in the kettle 70 from being too low and prevent the nozzle 90 from idling.

[0033] When the coolant temperature is within a preset first temperature threshold range, the range extender's own cooling system is used to dissipate heat, and the auxiliary cooling system is not involved.

[0034] When the coolant temperature is within the preset second temperature threshold range, the cooling system of the range extender itself participates in heat dissipation, and the auxiliary cooling system assists the range extender in maintaining sufficient cooling water flow to dissipate heat from the engine 20 in a timely manner.

[0035] The kettle 70 and the nozzle 90 are connected to each other through a water pipe. The nozzle 90 is fixedly connected to a position where water can be sprayed on the radiator 40 of the engine 20. The water in the kettle 70 is sprayed on the surface of the radiator 40 of the engine 20 by the nozzle 90, and begins to evaporate under the high temperature of the radiator 40 of the engine 20, taking away a large amount of heat during evaporation. Therefore, the coolant after passing through the radiator 40 is quickly cooled down and flows back to the engine 20 to take away more heat.

[0036] A range extender cooling control device, comprising: a storage module 210, a control module 230, an acquisition module 220, and a program stored on the memory for implementing the range extender cooling control method; the storage module 210 is used to store the program for implementing the range extender cooling control method, and the storage module 210 stores the program for implementing the range extender cooling control method; the acquisition module 220 is used to collect real-time values ​​of the range extender engine cooling system; and the control module 230 is used to execute the program for implementing the range extender cooling control method.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for an auxiliary cooling system of a range extender engine, characterized in that: The range extender is used in a range-extended electric vehicle, and the auxiliary cooling system device includes: The kettle directs the air-conditioning water to the kettle through the pipeline so that the kettle is used to hold the air-conditioning water. A limit switch is installed on the kettle; A main water pump and a cooling radiator, wherein the main water pump is used to deliver the coolant in the engine body to the cooling radiator when the range extender is started; The auxiliary water pump is used to deliver the coolant in the engine body to the cooling radiator when the range extender has a power generation demand, so as to ensure that when the engine is not started, there is still sufficient cooling water flow to dissipate heat from the engine in time at a low speed.

2. The device for the auxiliary cooling system of the range extender engine according to claim 1, characterized in that: Also includes: The range extender is composed of an engine and a generator, and is started, operates to generate electricity, and stops according to commands sent by the range extender cooling control device; During the operation of the range extender, the engine's main water pump will make the coolant in the water pipe flow through the mechanical structure. The higher the speed, the greater the cooling water flow.

3. The device for the auxiliary cooling system of the range extender engine according to claim 1, characterized in that: Also includes: The kettle and the limit switch, when the water level is lower than the minimum liquid level, the limit switch is turned on to prevent the water level in the kettle from being too low.

4. The device for the auxiliary cooling system of the range extender engine according to claim 1, characterized in that: Also includes: When the coolant temperature is within a preset first temperature threshold range, the range extender's own cooling system is used to dissipate heat, and the auxiliary cooling system is not involved.

5. The device for the auxiliary cooling system of the range extender engine according to claim 1, characterized in that: Also includes: When the coolant temperature is within the preset second temperature threshold range, the cooling system of the range extender itself participates in heat dissipation, and the auxiliary cooling system assists the range extender in maintaining sufficient cooling water flow to dissipate heat to the engine in a timely manner.

6. The device for the auxiliary cooling system of the range extender engine according to claim 1, characterized in that: Also includes: A kettle and a nozzle, wherein the kettle and the nozzle are connected via a water pipe, and the nozzle is fixedly connected at a position where water can be sprayed onto the radiator of the engine. The water in the kettle is sprayed onto the surface of the radiator of the engine by the nozzle, and begins to evaporate under the high temperature of the radiator of the engine, taking away a large amount of heat during evaporation.

7. The device for the auxiliary cooling system of the range extender engine according to claim 2, characterized in that: Also includes: A range extender cooling control device comprises: a storage module, a control module, and a collection module.

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