Device and method for regulating and controlling temperature of engine piston

Abstract

The invention discloses a regulation and control device and method for the temperature of an engine piston, regulation and control are implemented through the regulation and control device, and the regulation and control method comprises the steps that a mapping table of rotating speed-torque-proportional electromagnetic valve opening degree-piston temperature is established; setting a safe temperature threshold value of the piston; when the piston temperature is larger than or equal to the safe temperature threshold value, the control unit controls the opening degree of the proportional electromagnetic valve to be increased, and the oil injection amount of the piston cooling spray hook to lubricating oil of the inner cooling oil duct is increased so as to reduce the piston temperature. And when the temperature of the piston is smaller than the safe temperature threshold value, the control unit controls the opening degree of the proportional electromagnetic valve to be reduced, and the oil injection amount of the piston cooling spray hook to the inner cooling oil duct lubricating oil is reduced so as to increase the temperature of the piston. According to the device and method for regulating and controlling the temperature of the engine piston, the opening degree of the proportional electromagnetic valve can be controlled according to the rotating speed and the torque of the engine in the running state, and then the temperature of the piston is regulated and controlled within the most reasonable interval.

Description

Technical Field

[0001] The present invention relates to the field of engine design and manufacturing, and in particular to a device and method for controlling the temperature of an engine piston. Background Art

[0002] As one of the key components, the operating temperature of the engine piston directly affects the engine's performance and life. The engine piston is typically cooled by spraying oil into the piston's internal cold oil passage through a cooling spray hook. The cooling spray hook is directly mounted on the main oil passage. As the oil pressure in the main oil passage builds, it is sprayed along the spray hook's channel into the piston's internal cold oil passage. Some cooling spray hooks do not have valves and spray oil as long as there is oil pressure in the oil passage; some cooling spray hooks have mechanical valves that open the valve and spray oil when the oil pressure reaches a certain level. However, this cooling method has the following disadvantages:

[0003] Under high engine load, insufficient piston cooling can cause the piston to overheat under high-temperature conditions, impacting engine performance and life. At low engine load, when the piston temperature is low, unnecessary cooling oil injection reduces oil pump power consumption, which in turn affects fuel consumption and wastes energy. Current technical solutions cannot adjust to the actual piston temperature.

[0004] There is an urgent need to design a device and a control method for solving the problem that the existing engine piston cooling system cannot dynamically adjust the cooling oil injection amount according to the actual temperature of the piston.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The object of the present invention is to provide an engine piston temperature control device, which can control the opening of a proportional solenoid valve according to the speed and torque of the engine under running state, thereby regulating the piston temperature within the most reasonable range.

[0007] Another object of the present invention is to provide a method for controlling the temperature of an engine piston.

[0008] To achieve the above-mentioned objectives, the present invention provides an engine piston temperature control device, comprising an auxiliary oil passage, a plurality of piston cooling spray hooks, and a proportional solenoid valve; the auxiliary oil passage is arranged in the cylinder body and is located next to the main oil passage of the cylinder body, and the auxiliary oil passage is connected to the main oil passage; the plurality of piston cooling spray hooks are arranged at the auxiliary oil passage, and the plurality of piston cooling spray hooks are all connected to the internal cooling oil passage of the piston; the proportional solenoid valve is arranged at the entrance of the auxiliary oil passage and is located on the connecting oil passage between the auxiliary oil passage and the main oil passage; wherein the opening size of the proportional solenoid valve can control the amount of oil sprayed by the piston cooling spray hooks into the internal cooling oil passage of the piston.

[0009] In a preferred embodiment, the opening degree of the proportional solenoid valve is controlled by a control unit of the vehicle.

[0010] In a preferred embodiment, the engine piston temperature control device also includes an engine speed sensor, an engine torque sensor, a solenoid valve opening sensor and a piston temperature sensor, which is used to provide speed data, torque data, proportional solenoid valve opening data and piston temperature data to the control unit of the entire vehicle.

[0011] To achieve the other purpose mentioned above, the present invention also provides a method for controlling the temperature of an engine piston, which is implemented by a control device as described above. The control method includes: establishing a mapping table of speed-torque-proportional solenoid valve opening-piston temperature; setting a safe temperature threshold of the piston; when the piston temperature is greater than or equal to the safety temperature threshold, the control unit controls the opening of the proportional solenoid valve to increase, and increases the amount of lubricating oil sprayed by the piston cooling spray hook into the inner cold oil channel to reduce the piston temperature; and when the piston temperature is less than the safety temperature threshold, the control unit controls the opening of the proportional solenoid valve to decrease, and reduces the amount of lubricating oil sprayed by the piston cooling spray hook into the inner cold oil channel to increase the piston temperature.

[0012] In a preferred embodiment, the mapping table of speed-torque-proportional solenoid valve opening-piston temperature is established by bench testing.

[0013] In a preferred embodiment, the speed-torque-proportional solenoid valve opening-piston temperature mapping table includes the opening of the proportional solenoid valve at different speeds and torques and the corresponding piston temperatures.

[0014] In a preferred embodiment, the bench test should be conducted under different engine operating conditions and cover the full operating range of the engine to ensure the comprehensiveness and accuracy of the data.

[0015] In a preferred embodiment, the method for controlling the engine piston temperature also includes setting a minimum piston temperature threshold. When the engine is idling or running at a low load, the piston temperature at this time is less than the minimum piston temperature threshold. The control unit controls the proportional solenoid valve to close, and the piston cooling spray hook does not spray oil into the internal cooling oil channel for cooling.

[0016] In a preferred embodiment, when the engine is actually running, the control unit collects the engine speed and torque in real time, and calculates the opening of the proportional solenoid valve by querying the value of the mapping table of speed-torque-proportional solenoid valve opening-piston temperature. According to the calculation results, the control unit controls the opening of the proportional solenoid valve to control the amount of lubricating oil sprayed by the piston cooling spray hook into the internal cooling oil channel, thereby ensuring that the piston temperature is in the most reasonable range.

[0017] In a preferred embodiment, the method for controlling the engine piston temperature further includes a failure protection measure. When a communication anomaly or a sensor failure occurs, the control unit forcibly opens the proportional solenoid valve to the maximum opening to ensure piston cooling safety.

[0018] Compared with the prior art, the engine piston temperature control device and method of the present invention have the following beneficial effects: the key to the present invention is to add a separate auxiliary oil channel on the cylinder block, install a piston cooling spray hook on the auxiliary oil channel, and add a proportional solenoid valve at the inlet of the auxiliary oil channel to control the oil intake, thereby solving the problem of component layout and installation; applying the actual test data of the bench, a mapping table of speed-torque-proportional solenoid valve opening-piston temperature is established, and by monitoring the speed and torque of the actual running engine, the proportional solenoid valve opening is calculated, and the oil injection amount of the cooling spray hook is controlled to achieve accurate control of the piston temperature; according to the speed and torque under the engine running state, the proportional solenoid valve opening is controlled, thereby regulating the piston temperature within the most reasonable range; this scheme uses a solenoid valve to control the oil injection amount of the cooling spray hook to regulate the piston temperature. This control method can not only effectively ensure the cooling effect of the piston and extend its service life, but also increase the piston temperature when the piston temperature is too low, thereby increasing the temperature in the cylinder, improving thermal efficiency, and reducing fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the planar structural layout of a control device according to one embodiment of the present invention.

[0020] Description of main reference numerals:

[0021] 1-Cylinder block, 101-Main oil channel, 102-Auxiliary oil channel, 2-Piston cooling spray hook, 3-Proportional solenoid valve, 4-Control unit. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0023] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0024] like Figure 1As shown in the figure, a device for controlling the temperature of an engine piston according to a preferred embodiment of the present invention includes a secondary oil passage 102, multiple piston cooling spray hooks 2 and a proportional solenoid valve 3; the secondary oil passage 102 is arranged in the cylinder block 1 and is located next to the main oil passage 101 of the cylinder block 1, and the secondary oil passage 102 is connected to the main oil passage 101; multiple piston cooling spray hooks 2 are arranged at the secondary oil passage 102, and the multiple piston cooling spray hooks 2 are all connected to the inner cooling oil passage of the piston; the proportional solenoid valve 3 is arranged at the entrance of the secondary oil passage 102 and is located on the connecting oil passage between the secondary oil passage 102 and the main oil passage 101; the opening size of the proportional solenoid valve 3 can control the amount of oil sprayed by the piston cooling spray hook 2 to the inner cooling oil passage of the piston.

[0025] In some embodiments, the opening degree of the proportional solenoid valve 3 is controlled by a control unit 4 (ECU) of the vehicle.

[0026] In some embodiments, the engine piston temperature control device also includes an engine speed sensor, an engine torque sensor, a solenoid valve opening sensor and a piston temperature sensor, which is used to provide speed data, torque data, proportional solenoid valve opening data and piston temperature data to the control unit 4 of the entire vehicle.

[0027] See also Figure 1 According to a preferred embodiment of the present invention, a method for controlling the temperature of an engine piston is implemented by a control device as described above. The control method includes: establishing a mapping table of speed-torque-proportional solenoid valve opening-piston temperature (T_piston); setting a safety temperature threshold (T_safe) of the piston, for example, 360°C as a safety temperature, which is only schematic and the present invention is not limited to this; when the piston temperature is greater than or equal to the safety temperature threshold, the control unit controls the opening of the proportional solenoid valve to increase, and increases the amount of lubricating oil sprayed by the piston cooling spray hook into the inner cold oil channel to reduce the piston temperature; and when the piston temperature is less than the safety temperature threshold, the control unit controls the opening of the proportional solenoid valve to decrease, and reduces the amount of lubricating oil sprayed by the piston cooling spray hook into the inner cold oil channel to increase the piston temperature.

[0028] In some embodiments, establishing a mapping table of speed-torque-proportional solenoid valve opening-piston temperature is obtained through bench testing.

[0029] In some embodiments, the speed-torque-proportional solenoid valve opening-piston temperature mapping table includes the opening of the proportional solenoid valve at different speeds and torques and the corresponding piston temperatures.

[0030] In some embodiments, the bench test should be performed under different operating conditions of the engine and cover the full operating range of the engine to ensure the comprehensiveness and accuracy of the data.

[0031] In some embodiments, the method for controlling the engine piston temperature further includes setting a minimum piston temperature threshold (T_min), for example, a temperature of 200°C is used as the minimum piston temperature threshold. This safety temperature is only indicative and the present invention is not limited thereto. When the engine is idling or running at a low load, the piston temperature at this time is less than the minimum piston temperature threshold. The control unit controls the proportional solenoid valve to close, and the piston cooling spray hook does not spray oil into the internal cooling oil channel for cooling.

[0032] In some embodiments, when the engine is actually running, the control unit collects the engine speed and torque in real time, and calculates the opening of the proportional solenoid valve by querying the value of the mapping table of speed-torque-proportional solenoid valve opening-piston temperature. According to the calculation result, the control unit controls the opening of the proportional solenoid valve and controls the amount of lubricating oil sprayed by the piston cooling spray hook into the internal cooling oil channel, thereby ensuring that the piston temperature is in the most reasonable range.

[0033] In some embodiments, the method for controlling the engine piston temperature further includes a failure protection measure. When a communication anomaly or a sensor failure occurs, the control unit forcibly opens the proportional solenoid valve to the maximum opening to ensure piston cooling safety.

[0034] In summary, the engine piston temperature control device and method of the present invention have the following advantages: the key to the present invention is to add a separate auxiliary oil channel on the cylinder block, install a piston cooling spray hook on the auxiliary oil channel, and add a proportional solenoid valve at the inlet of the auxiliary oil channel to control the oil intake, which solves the problem of component layout and installation; using the actual test data of the bench, a mapping table of speed-torque-proportional solenoid valve opening-piston temperature is established, and by monitoring the speed and torque of the actual running engine, the proportional solenoid valve opening is calculated, and the oil injection amount of the cooling spray hook is controlled to achieve accurate control of the piston temperature; according to the speed and torque under the engine running state, the proportional solenoid valve opening is controlled, and then the piston temperature is regulated within the most reasonable range; this scheme uses a solenoid valve to control the oil injection amount of the cooling spray hook to regulate the piston temperature. This control method can not only effectively ensure the cooling effect of the piston and extend its service life, but also increase the piston temperature when the piston temperature is too low, thereby increasing the temperature in the cylinder, improving thermal efficiency, and reducing fuel consumption.

[0035] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many variations and modifications are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and modifications. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A device for controlling engine piston temperature, characterized in that: include: an auxiliary oil passage, which is provided in the cylinder body and is located beside the main oil passage of the cylinder body, and the auxiliary oil passage is communicated with the main oil passage; a plurality of piston cooling spray hooks, which are arranged at the auxiliary oil passage, and the plurality of piston cooling spray hooks are all connected to the inner cooling oil passage of the piston; as well as a proportional solenoid valve, which is arranged at the inlet of the auxiliary oil passage and located on the connecting oil passage between the auxiliary oil passage and the main oil passage; The opening degree of the proportional solenoid valve can control the amount of oil sprayed by the piston cooling spray hook to the inner cooling oil channel of the piston.

2. The engine piston temperature control device according to claim 1, characterized in that: The opening degree of the proportional solenoid valve is controlled by the control unit of the vehicle.

3. The engine piston temperature control device according to claim 1, characterized in that: It also includes an engine speed sensor, an engine torque sensor, a solenoid valve opening sensor and a piston temperature sensor, which are used to provide speed data, torque data, proportional solenoid valve opening data and piston temperature data to the control unit of the entire vehicle.

4. A method for controlling the temperature of an engine piston, wherein the method is implemented by using the control device according to any one of claims 1 to 3, characterized in that: The control method comprises: Establish a mapping table of speed-torque-proportional solenoid valve opening-piston temperature; Set the safe temperature threshold of the piston; When the piston temperature is greater than or equal to the safety temperature threshold, the control unit controls the opening of the proportional solenoid valve to increase, thereby increasing the amount of lubricating oil sprayed by the piston cooling spray hook into the internal cooling oil channel to reduce the piston temperature; and When the piston temperature is lower than the safety temperature threshold, the control unit controls the opening of the proportional solenoid valve to decrease, thereby reducing the amount of lubricating oil sprayed by the piston cooling spray hook into the inner cooling oil channel to increase the piston temperature.

5. The method for controlling the engine piston temperature according to claim 1, wherein: The mapping table of speed-torque-proportional solenoid valve opening-piston temperature is obtained through bench testing.

6. The method for controlling the engine piston temperature according to claim 5, wherein: The speed-torque-proportional solenoid valve opening-piston temperature mapping table includes the opening of the proportional solenoid valve and the corresponding piston temperature at different speeds and torques.

7. The method for controlling the engine piston temperature according to claim 5, wherein: The bench test should be carried out under different operating conditions of the engine and cover the full operating range of the engine to ensure the comprehensiveness and accuracy of the data.

8. The method for controlling the engine piston temperature according to claim 1, wherein: It also includes setting a minimum piston temperature threshold. When the engine is idling or running under low load, the piston temperature at this time is lower than the minimum piston temperature threshold. The control unit controls the proportional solenoid valve to close, and the piston cooling spray hook does not spray oil into the internal cooling oil channel for cooling.

9. The method for controlling the engine piston temperature according to claim 1, wherein: When the engine is actually running, the control unit collects the engine speed and torque in real time, and calculates the opening of the proportional solenoid valve by querying the value of the mapping table of speed-torque-proportional solenoid valve opening-piston temperature. According to the calculation result, the control unit controls the opening of the proportional solenoid valve to control the amount of lubricating oil sprayed by the piston cooling spray hook into the internal cooling oil channel, thereby ensuring that the piston temperature is in the most reasonable range.

10. The method for controlling the engine piston temperature according to claim 1, wherein: The system also includes a failure protection measure. When a communication anomaly or a sensor failure occurs, the control unit forces the proportional solenoid valve to open to the maximum opening to ensure piston cooling safety.

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