CN211598838U - Control device for preventing cavitation of high-pressure oil pump - Google Patents
Control device for preventing cavitation of high-pressure oil pump Download PDFInfo
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- CN211598838U CN211598838U CN202020089095.XU CN202020089095U CN211598838U CN 211598838 U CN211598838 U CN 211598838U CN 202020089095 U CN202020089095 U CN 202020089095U CN 211598838 U CN211598838 U CN 211598838U
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Abstract
The utility model provides a prevent controlling means of high-pressure oil pump cavitation belongs to mechanical technical field. It has solved the problem that has high-pressure oil pump cavitation among the prior art. The control device for preventing the cavitation of the high-pressure oil pump comprises a controller, a low-pressure oil pump, a signal acquisition unit, a pressure sensor and a temperature sensor, wherein the low-pressure oil pump is connected with the controller and used for being connected with an oil tank, the signal acquisition unit is used for acquiring the current running working condition of a vehicle, the pressure sensor is used for detecting the oil pressure in the low-pressure fuel pipe, the temperature sensor is used for detecting the oil temperature in the low-pressure fuel pipe, the controller is used for acquiring the target fuel pressure according to the current running working condition of the vehicle acquired by the signal acquisition unit and combining the current fuel temperature acquired by the temperature sensor, and then outputting a corresponding control signal to the low-pressure oil pump according to the target fuel pressure, and the. The control device can improve the problem of cavitation caused by fuel vaporization to the high-pressure oil pump.
Description
Technical Field
The utility model belongs to the technical field of the car, a prevent controlling means of high-pressure oil pump cavitation is related to.
Background
Gasoline is the main fuel of traditional internal combustion engines and is widely used in the industries of automobiles, motorcycles, yachts and the like. At present, the fuel supply mode of the direct injection gasoline engine in the cylinder is that an electric control type variable pressure gasoline pump outputs fuel with corresponding pressure, the fuel is conveyed into a high-pressure oil pump oil chamber through a fuel pipeline, a plunger of the high-pressure oil pump is driven by a cam shaft, the plunger ascends to compress the fuel and an ECU outputs a duty ratio signal to close an oil suction valve, when the pressure in an oil chamber is higher than the pressure in an oil rail, a discharge valve of the high-pressure oil pump is opened, the high-pressure fuel enters the oil rail, and the fuel is injected into the cylinder through an oil injector.
When a vehicle runs normally, the fuel pressure output by a gasoline pump is relatively stable, but under the working conditions of rapid acceleration or rapid deceleration, the low-pressure fuel pressure can drop suddenly, and at a certain temperature, the fuel in a pipeline generates bubbles, which is called cavitation. When bubbles generated during cavitation flow to a high-pressure part, the bubbles are reduced in size and are broken, and the high frequency and impact strength during cavitation bubble generation and bubble breakage can cause the damage of a stator of an oil inlet valve of a high-pressure oil pump, so that the surface of the stator of the oil inlet valve of the high-pressure oil pump is corroded, and the function failure of the high-pressure oil pump is caused.
Disclosure of Invention
The utility model aims at the above-mentioned problem that prior art exists, provide a prevent controlling means of high-pressure oil pump cavitation, its technical problem that solves is: how to improve the cavitation caused by the fuel vaporization to the high-pressure oil pump.
The purpose of the utility model can be realized by the following technical proposal: a control device for preventing cavitation of a high-pressure oil pump comprises a low-pressure oil pump for connecting an oil tank and a signal acquisition unit for acquiring the current running condition of a vehicle, characterized in that the control device also comprises a controller, a pressure sensor for detecting the fuel pressure in the low-pressure fuel pipe and a temperature sensor for detecting the fuel temperature in the low-pressure fuel pipe, the signal acquisition unit, the pressure sensor, the temperature sensor and the low-pressure oil pump are all connected with the controller, the controller is used for acquiring target fuel pressure according to the current running working condition of the vehicle acquired by the signal acquisition unit and in combination with the current fuel temperature acquired by the temperature sensor, and outputting a corresponding control signal to the low-pressure oil pump according to the target fuel pressure, wherein the controller is also used for judging whether the low-pressure oil pump works normally according to the fuel pressure fed back by the pressure sensor.
The working principle of the control device for preventing the cavitation of the high-pressure oil pump is as follows: the signal acquisition unit acquires the current operating condition of the vehicle and transmits the current operating condition to the controller, the temperature sensor detects the fuel temperature in the low-pressure fuel pipe in real time and transmits the fuel temperature to the controller, the controller judges the received current operating condition of the vehicle, and combines the fuel temperature output by the temperature sensor to obtain the target fuel pressure according to the relation of the gasoline temperature, the pressure and the vaporization, further, a proper control signal is output according to the target fuel pressure so as to increase the output pressure of the low-pressure oil pump and reduce the occurrence probability of fuel vaporization, thereby improving the problem of cavitation caused by fuel vaporization to the high-pressure oil pump, after the low-pressure oil pump works according to the control signal, the controller analyzes the fuel pressure value fed back by the pressure sensor and the target fuel pressure, judges whether the low-pressure oil pump works normally or not, and improves the accuracy of the output pressure of the low-pressure oil pump.
In the control device for preventing the cavitation of the high-pressure oil pump, the temperature sensor adopts a thermistor R1 with a negative temperature coefficient, and the thermistor R1 is connected with a pull-up resistor R2 in series and then is connected with the input end of the controller. The controller provides input voltage to the thermistor R1, when the resistance value of the thermistor R1 changes due to the fuel temperature, the current value in the circuit changes, and the controller judges the voltage shared by the thermistor R1 according to the current value, so that the fuel temperature is judged.
In the control device for preventing cavitation of the high-pressure oil pump, the signal acquisition unit comprises a rotation speed sensor for acquiring a rotation speed signal of the engine, a throttle position sensor for acquiring a throttle opening signal, a water temperature sensor for acquiring a water temperature signal, an air intake pressure sensor for acquiring an air intake quantity signal, a vehicle speed sensor for acquiring a vehicle speed signal and an oxygen sensor for acquiring an air-fuel ratio signal, and the rotation speed sensor, the throttle position sensor, the water temperature sensor, the air intake pressure sensor, the vehicle speed sensor and the oxygen sensor are all connected with the controller.
In the control device for preventing cavitation of the high-pressure oil pump, the low-pressure oil pump adopts a variable-pressure gasoline pump, and the variable-pressure gasoline pump is connected with the controller. The variable pressure gasoline pump is arranged on the controller of the controller, so that the variable pressure gasoline pump can act according to the target fuel pressure, the operation and the control are simpler and more convenient, the output of the variable pressure gasoline pump can be adjusted at any time according to the fuel pressure and the fuel temperature fed back by the pressure sensor, and the problem of cavitation caused by fuel vaporization on the high-pressure gasoline pump can be effectively solved.
In the control device for preventing the cavitation of the high-pressure oil pump, the control device further comprises an alarm, and the alarm is connected with the output end of the controller. The alarm can give an alarm when the fuel pressure fed back by the pressure sensor is greatly different from the target fuel pressure, reminds a driver that the fuel pressure is abnormal and cavitation probably occurs, and can play a role in reminding the driver to check the vehicle in time and improving the driving safety.
In the above control device for preventing cavitation of the high-pressure oil pump, the controller is an engine ECU.
Compared with the prior art, the control device for preventing the cavitation of the high-pressure oil pump has the following advantages:
1. the utility model discloses an arrange temperature sensor in the low pressure fuel pipe, make the controller can reach target fuel pressure according to the fuel temperature and combine its petrol vaporization's characteristic, and then export corresponding control signal and give the low-pressure oil pump to increase the output pressure of low-pressure oil pump, reduce the incidence of fuel vaporization, and then improve the cavitation problem of fuel vaporization to the high-pressure oil pump.
2. The utility model discloses still set up pressure sensor and fed back the fuel pressure in to the low pressure fuel pipe, ensured that low-pressure oil pump output pressure is more accurate.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the fuel system of the present invention.
In the figure, 1, a controller; 2. a pressure sensor; 3. a temperature sensor; 4. a signal acquisition unit; 41. a rotational speed sensor; 42. a throttle position sensor; 43. a water temperature sensor; 44. an intake air pressure sensor; 45. a vehicle speed sensor; 46. an oxygen sensor; 5. a low pressure oil pump; 6. a low pressure fuel line; 7. a high pressure fuel pipe; 8. a high-pressure oil pump; 9. an oil rail assembly; 10. an oil injector; 11. an oil tank; 12. an alarm.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1, the control device for preventing cavitation of the high-pressure oil pump 8 comprises a controller 1, a low-pressure oil pump 5 connected with the controller 1 and used for being connected with an oil tank 11, a signal acquisition unit 4 used for acquiring the current operation condition of the vehicle, a pressure sensor 2 used for detecting the oil pressure in a low-pressure fuel pipe 6 and a temperature sensor 3 used for detecting the oil temperature in the low-pressure fuel pipe 6, wherein the controller 1 is used for acquiring the target fuel pressure according to the current operation condition of the vehicle acquired by the signal acquisition unit 4 and combining the current fuel temperature acquired by the temperature sensor 3 and outputting a corresponding control signal to the low-pressure oil pump 5 according to the target fuel pressure, and the controller 1 is further used for judging whether the low-pressure oil pump 5 normally works or not according to the fuel pressure fed back by the pressure.
Preferably, the temperature sensor 3 adopts a thermistor R1 with a negative temperature coefficient, and the thermistor R1 is connected with a pull-up resistor R2 in series and then is connected with the input end of the controller 1. The controller 1 supplies an input voltage to the thermistor R1, when the resistance value of the thermistor R1 changes due to a fuel temperature, the current value in the circuit changes, and the controller 1 determines the voltage shared by the thermistor R1 according to the current value, thereby determining the fuel temperature. The pull-up resistor R2 and the thermistor R1 can select corresponding resistance values according to requirements.
Preferably, the signal acquisition unit 4 comprises a rotation speed sensor 41 for acquiring an engine rotation speed signal, a throttle position sensor 42 for acquiring a throttle opening signal, a water temperature sensor 43 for acquiring a water temperature signal, an intake air pressure sensor 44 for acquiring an intake air quantity signal, a vehicle speed sensor 45 for acquiring a vehicle speed signal, and an oxygen sensor 46 for acquiring an air-fuel ratio signal, wherein the rotation speed sensor 41, the throttle position sensor 42, the water temperature sensor 43, the intake air pressure sensor 44, the vehicle speed sensor 45, and the oxygen sensor 46 are all connected with the controller 1.
Preferably, the low-pressure oil pump 5 is a variable-pressure gasoline pump, and the variable-pressure gasoline pump is connected with the controller 1. The variable pressure gasoline pump is arranged in the controller 1 of the controller 1, the variable pressure gasoline pump can act according to the target fuel pressure, the operation and the control are simpler and more convenient, the output of the variable pressure gasoline pump can be adjusted at any time according to the fuel pressure and the fuel temperature fed back by the pressure sensor 2, and the problem that the fuel is vaporized to cause cavitation of the high pressure gasoline pump 8 can be effectively solved.
As another preferable scheme, the low pressure oil pump 5 includes a gasoline pump and an oil pressure regulator, and the oil pressure regulator is connected to the controller 1.
Preferably, the control device further comprises an alarm 12, and the alarm 12 is connected with the output end of the controller 1. Preferably, the alarm 12 may be an audible alarm and/or a light alarm. The alarm 12 can give an alarm when the fuel pressure fed back by the pressure sensor 2 is greatly different from the target fuel pressure, remind a driver of cavitation possibly occurring when the fuel pressure is abnormal, remind the driver of checking the vehicle in time and improve the driving safety.
Preferably, the controller 1 is an engine ECU.
The working principle of the control device for preventing the cavitation of the high-pressure oil pump 8 is as follows: as shown in fig. 2, the fuel system includes a fuel tank 11, a low-pressure fuel pump 5, a low-pressure fuel pipe 6, a high-pressure fuel pump 8, a high-pressure fuel pipe 7, a fuel rail assembly 9 and a fuel injector 10, the fuel tank 11 is connected with the low-pressure fuel pipe 6, the low-pressure fuel pump 5 is arranged on the low-pressure fuel pipe 6 and used for extracting fuel in the fuel tank 11, the low-pressure fuel pipe 6 is connected with an oil inlet pipe of the high-pressure fuel pump 8, the high-pressure fuel pump 8 is connected with the fuel rail assembly 9 through the high-pressure fuel pipe 7, and the fuel rail assembly.
In order to solve the problem of fuel vaporization, a temperature sensor 3 is arranged on a low-pressure fuel pipe 6, preferably, the temperature sensor 3 adopts a thermistor R1 with a negative temperature coefficient, the thermistor R1 is connected with a pull-up resistor R2 in series and then is connected with the input end of the controller 1, and the controller 1 provides power supply voltage for the thermistor R1. When the vehicle starts, the rotation speed sensor 41, the throttle position sensor 42, the water temperature sensor 43, the air inlet pressure sensor 44, the vehicle speed sensor 45 and the oxygen sensor 46 in the signal acquisition unit 4 respectively acquire the engine rotation speed, the throttle opening, the water temperature, the air intake quantity, the vehicle speed and the air-fuel ratio and transmit the signals to the controller 1, the controller 1 comprehensively judges the current vehicle operation condition according to the acquired signals of the engine rotation speed, the throttle opening, the water temperature, the air intake quantity, the vehicle speed, the air-fuel ratio and the like, a preset fuel injection quantity MAP is looked up according to the current vehicle operation condition, the controller 1 determines the actual temperature of fuel according to the current value change of the thermistor R1, the target fuel pressure is finally acquired by comparing the actual temperature of the fuel with a prestored gasoline temperature, pressure and vaporization region relation table, and a corresponding control signal is output to the low-pressure oil pump 5 according to the target, the low-pressure oil pump 5 pressurizes gasoline in the oil tank 11 according to a control signal received by the controller 1 and then conveys the pressurized gasoline to the high-pressure oil pump 8 through the low-pressure fuel pipe 6, the pressure sensor 2 arranged in the low-pressure fuel pipe 6 detects fuel pressure in the low-pressure fuel pipe 6, so that the fuel pressure is fed back to the controller 1, the controller 1 analyzes a fed-back actual value of the fuel pressure and target fuel pressure, whether the fuel system operates normally is judged, further, the output pressure of the low-pressure fuel pump can be more accurate, when the fuel system is judged to operate abnormally, the controller 1 can control the alarm 12 to give an alarm, drivers can find vehicle problems in time, and the driving safety of vehicles is improved.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. A control device for preventing cavitation of a high-pressure oil pump comprises a low-pressure oil pump (5) used for being connected with an oil tank (11) and a signal acquisition unit (4) used for acquiring the current running working condition of a vehicle, and is characterized by further comprising a controller (1), a pressure sensor (2) used for detecting the oil pressure in a low-pressure fuel pipe (6) and a temperature sensor (3) used for detecting the oil temperature in the low-pressure fuel pipe (6), wherein the signal acquisition unit (4), the pressure sensor (2), the temperature sensor (3) and the low-pressure oil pump (5) are all connected with the controller (1), the controller (1) is used for acquiring the target fuel pressure according to the current running working condition of the vehicle acquired by the signal acquisition unit (4) and by combining the current fuel temperature acquired by the temperature sensor (3), and further outputting a corresponding control signal to the low-pressure oil pump (5) according to the target fuel pressure, the controller (1) is also used for judging whether the low-pressure oil pump (5) works normally according to the fuel pressure fed back by the pressure sensor (2).
2. The control device for preventing the cavitation of the high-pressure oil pump according to the claim 1, characterized in that the temperature sensor (3) adopts a thermistor R1 with negative temperature coefficient, and the thermistor R1 is connected with the input end of the controller (1) after being connected with a pull-up resistor R2 in series.
3. The control device for preventing cavitation of the high-pressure oil pump according to claim 1, characterized in that the signal acquisition unit (4) comprises a rotation speed sensor (41) for acquiring an engine rotation speed signal, a throttle position sensor (42) for acquiring a throttle opening signal, a water temperature sensor (43) for acquiring a water temperature signal, an intake air pressure sensor (44) for acquiring an intake air amount signal, a vehicle speed sensor (45) for acquiring a vehicle speed signal and an oxygen sensor (46) for acquiring an air-fuel ratio signal, and the rotation speed sensor (41), the throttle position sensor (42), the water temperature sensor (43), the intake air pressure sensor (44), the vehicle speed sensor (45) and the oxygen sensor (46) are all connected with the controller (1).
4. The control device for preventing the cavitation of the high-pressure oil pump according to claim 1, 2 or 3, characterized in that the low-pressure oil pump (5) adopts a variable-pressure gasoline pump, and the variable-pressure gasoline pump is connected with the controller (1).
5. The control device for preventing the cavitation of the high-pressure oil pump according to the claim 1, the 2 or the 3, characterized in that, the control device also comprises an alarm (12), and the alarm (12) is connected with the output end of the controller (1).
6. The control device for preventing cavitation of a high-pressure oil pump according to claim 1, 2 or 3, characterized in that the controller (1) is an engine ECU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020089095.XU CN211598838U (en) | 2020-01-15 | 2020-01-15 | Control device for preventing cavitation of high-pressure oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020089095.XU CN211598838U (en) | 2020-01-15 | 2020-01-15 | Control device for preventing cavitation of high-pressure oil pump |
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| Publication Number | Publication Date |
|---|---|
| CN211598838U true CN211598838U (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020089095.XU Expired - Fee Related CN211598838U (en) | 2020-01-15 | 2020-01-15 | Control device for preventing cavitation of high-pressure oil pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931728A (en) * | 2021-01-19 | 2022-01-14 | 吉利汽车研究院（宁波）有限公司 | Oil vapor control method, device and system and storage medium |
| CN114962103A (en) * | 2022-06-10 | 2022-08-30 | 中国第一汽车股份有限公司 | Fuel supply system and vehicle |
-
2020
- 2020-01-15 CN CN202020089095.XU patent/CN211598838U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931728A (en) * | 2021-01-19 | 2022-01-14 | 吉利汽车研究院（宁波）有限公司 | Oil vapor control method, device and system and storage medium |
| CN114962103A (en) * | 2022-06-10 | 2022-08-30 | 中国第一汽车股份有限公司 | Fuel supply system and vehicle |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200929 Termination date: 20220115 |