CN109505691B - Piston cooling oil injection system, engine and oil injection control method - Google Patents
Piston cooling oil injection system, engine and oil injection control method Download PDFInfo
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- CN109505691B CN109505691B CN201811554556.XA CN201811554556A CN109505691B CN 109505691 B CN109505691 B CN 109505691B CN 201811554556 A CN201811554556 A CN 201811554556A CN 109505691 B CN109505691 B CN 109505691B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
- F01P3/08—Cooling of piston exterior only, e.g. by jets
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- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a piston cooling oil injection system, an engine and an oil injection control method, wherein the system comprises a main oil duct, an air oil duct, an electromagnetic valve, a controller and a piston cooling nozzle; the main oil gallery is connected with an oil pump of the engine, and the empty oil gallery is connected with the main oil gallery; the piston cooling nozzle is arranged on the air oil passage; the electromagnetic valve is respectively connected with the controller and the empty oil passage, and the electromagnetic valve can be opened or closed and the opening degree of the electromagnetic valve can be adjusted through the control of the controller, so that the communication or the cut-off of the empty oil passage and the main oil passage and the adjustment of the flow rate of the engine oil in the empty oil passage are realized. According to the piston cooling oil injection system and the engine, the air oil duct and the electromagnetic valve are arranged, and the flow of engine oil input into the piston cooling nozzle can be controlled by controlling the opening degree of the electromagnetic valve, so that the oil injection time and the oil injection quantity can be accurately controlled according to the heat load of the engine, and the piston is prevented from being excessively cooled.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a piston cooling oil injection system, an engine and an oil injection control method.
Background
The piston cooling oil injection system is one of important parts of an engine, and mainly injects engine oil to cool a piston and prevent the piston from overheating and pulling a cylinder.
The existing piston cooling oil injection system is directly communicated with a main oil duct in the running process of an engine, and the opening and closing of a control valve of the piston cooling oil injection system are controlled only according to the pressure of the main oil duct, but if the heat load of a piston is not high and the piston cooling oil injection system continues to inject oil, the piston is overcooled, and the heat efficiency of the engine is reduced.
Disclosure of Invention
The invention aims to provide a piston cooling oil injection system, an engine and an oil injection control method, which are used for solving the problems in the prior art, realizing the dynamic adjustment of the oil injection quantity according to the thermal load of a piston, realizing the accurate cooling of the piston and improving the thermal efficiency of the engine.
The invention provides a piston cooling oil injection system, which comprises:
a main oil gallery connected with the oil pump;
the air oil duct is connected with the main oil duct;
the electromagnetic valve is respectively connected with the controller and the air oil channel;
the controller is used for controlling the opening of the electromagnetic valve;
and the piston cooling nozzle is arranged on the air oil passage.
The piston cooling oil injection system as described above, preferably, the piston cooling nozzle is provided in plurality, each piston cooling nozzle is connected to one cylinder block in the engine, and the inner diameters of the plurality of piston cooling nozzles are sequentially increased from the cylinder block close to the water inlet of the engine to the direction away from the cylinder block at the water inlet.
The piston cooling oil injection system as described above, wherein preferably, the maximum oil injection speed of the piston cooling nozzle under the condition that the oil pressure of the main oil gallery is 2.45bar is not less than 13.2m/s, so that the oil injection speed is greater than the instantaneous speed of the piston, and the oil sprayed out by the piston cooling nozzle can smoothly enter the piston inner cooling oil gallery to realize oscillation cooling.
The piston cooling oil injection system as described above, wherein it is preferable that the maximum oil injection speed of the piston cooling nozzle under the condition that the main gallery oil pressure is 4bar is not less than 17.9 m/s.
The invention also provides an engine which comprises an oil pump and a cylinder body, wherein the engine also comprises the piston cooling oil injection system provided by the invention, the main oil gallery is connected with the oil pump, and the piston cooling nozzle is connected with the cylinder body.
The engine as described above, wherein, preferably, the engine further comprises an engine cooler and an engine oil temperature sensor, wherein the engine oil temperature sensor is connected with the oil inlet side of the engine cooler;
the engine oil temperature sensor is used for sending a detected engine oil temperature signal to the controller, and the controller controls the opening degree of the electromagnetic valve according to the engine oil temperature signal.
The engine as described above, wherein it is preferable that a water jacket and a water temperature sensor are further included, the water temperature sensor being provided on the water jacket;
the water temperature sensor is used for sending a detected water temperature signal to the controller, and the controller controls the opening of the electromagnetic valve according to the water temperature signal.
The invention also provides an oil injection control method, wherein the piston cooling oil injection system and the engine provided by the invention are adopted, and the method comprises the following steps:
step 1, detecting whether the power of an engine reaches a set power, and if so, entering step 2;
step 2, controlling the electromagnetic valve to open so that the piston cooling nozzle injects oil at a first flow rate;
step 3, detecting whether the power of the engine reaches the rated power, and if so, entering step 4;
and 4, controlling the opening degree of the electromagnetic valve to be opened to the maximum value so that the piston cooling nozzle injects oil at a second flow rate.
In the above-described fuel injection control method, preferably, step 1 specifically includes:
step 11, detecting whether the power of the engine reaches a set power, and if so, entering step 12;
step 12, detecting whether the temperature of the engine oil reaches a set oil temperature, and if so, entering step 13;
and step 13, detecting whether the water temperature of the engine reaches the set water temperature, and if so, entering step 2.
The fuel injection control method as described above, wherein preferably, the first flow rate is obtained specifically according to the following formula:
Q＝P′×0.08L/min
wherein Q represents a first flow rate, and P' represents a set power;
the second flow rate is specifically obtained according to the following formula:
Q＝P0×0.08L/min
wherein Q represents a first flow rate, P0Indicating the rated power.
According to the piston cooling oil injection system, the engine and the oil injection control method, the air oil duct and the electromagnetic valve are arranged, and the flow of engine oil input into the piston cooling nozzle can be controlled by controlling the opening degree of the electromagnetic valve, so that the oil injection time and the oil injection quantity can be accurately controlled according to the heat load of the engine, and the piston is prevented from being excessively cooled.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating a piston-cooled fuel injection system according to an embodiment of the present invention when a solenoid valve is closed;
fig. 2 is a diagram illustrating a state of the piston-cooled oil injection system when the solenoid valve is opened according to the embodiment of the invention.
Description of reference numerals:
100-main oil gallery 200-air gallery 300-solenoid valve
400-piston cooling nozzle 500-oil pump
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides a piston cooling oil injection system, which includes a main gallery 100, an air gallery 200, a solenoid valve 300, a controller, and a piston cooling nozzle 400; the main oil gallery 100 is connected with an oil pump 500 of an engine, and the empty oil gallery 200 is connected with the main oil gallery 100; the piston cooling nozzle 400 is disposed on the air gallery 200; the electromagnetic valve 300 is connected to the controller and the air oil gallery 200, and the electromagnetic valve 300 can be controlled by the controller to open or close and adjust the opening degree, so as to communicate and cut off the air oil gallery 200 and the main oil gallery 100 and adjust the flow rate of the oil in the air oil gallery 200. The controller may be specifically an ECU.
Specifically, for an engine with the rated power of 95kW, the maximum opening flow of a throttle valve is 95 × 0.08.08L/min-7.6L/min, and when the power of the engine piston per unit area is greater than 2.5MW/m2When the calculated power is larger than 54kW for a piston with the diameter of 83mm, the electromagnetic valve is opened, the piston cooling nozzle starts to inject oil, and the opening flow is not lower than 54 × 0.08L/min to 4.3L/min.
Specifically, when the power of the engine is detected to be increased, and the oil temperature and the water temperature of the cooling water are increased, the controller controls the electromagnetic valve 300 to be opened or enlarged, so that the main oil gallery 100 is communicated with the air gallery 200 or the flow rate of the air gallery 200 is increased, and the oil in the main oil gallery 100 enters the air gallery 200 connected with the piston cooling nozzle 400, so that the oil in the main oil gallery 100 is injected into the cylinder of the engine through the piston cooling nozzle 400, and the piston is cooled.
When the power of the engine is detected to be reduced and the temperature of the engine oil and the temperature of cooling water are detected to be reduced, the controller controls the opening of the electromagnetic valve 300 to be reduced until the electromagnetic valve is closed, so that the flow rates of the main oil duct 100 and the air oil duct 200 are reduced or cut off, and when the electromagnetic valve is cut off, the engine oil can only flow in the main oil duct 100 and cannot enter the air oil duct 200 and the piston cooling nozzle 400, so that the problem of piston supercooling caused by continuous injection of the engine oil under the condition of low heat load of the piston is avoided; when the heat load of the piston is reduced, the flow is reduced, so that the piston can be properly cooled and overcooling can be avoided.
By providing the air gallery 200 and the solenoid valve 300, the flow rate of the engine oil input to the piston cooling nozzle 400 can be controlled by controlling the opening degree of the solenoid valve 300. By adopting the oil injection scheme, the oil injection of the piston cooling nozzle 400 can be free from the influence of the pressure of the main oil passage 100, the oil injection quantity of the piston cooling nozzle 400 is only influenced by the power of the engine, the temperature of engine oil and the temperature of cooling water, and the factors can truly reflect the heat load of the engine, so that the accurate control of the oil injection time and the oil injection quantity according to the heat load of the engine is realized, and the excessive cooling of the piston is avoided.
It should be noted that, since the front end of the cylinder block of the engine is provided with the water inlet, the cooling effect of the cylinder block and the cylinder hole gradually deteriorates from the cylinder block close to the water inlet to the cylinder block far from the water inlet, and particularly, the cylinder block farthest from the water inlet is likely to have a problem of cylinder scuffing. Therefore, in order to ensure the cooling balance of each cylinder of the engine, in the present embodiment, a plurality of piston cooling nozzles 400 may be provided, each piston cooling nozzle 400 is connected to one cylinder block in the engine, and the inner diameters of the plurality of piston cooling nozzles 400 are sequentially increased from the cylinder block near the water inlet of the engine to the direction away from the cylinder block at the water inlet. Therefore, different flow output of the piston cooling nozzles 400 can be realized under the condition that the electromagnetic valve 300 is opened to keep the same opening, the requirements of different oil injection quantities of the pistons in different cylinders are met, the cooling of the pistons is more accurate, and the uniformity of combustion in each cylinder is ensured.
Specifically, when the electromagnetic valve 300 is opened (the electromagnetic valve does not reach the maximum opening), the maximum oil injection speed of the piston cooling nozzle 400 under the condition that the oil pressure of the main oil gallery 100 is 2.45bar is not less than 13.2m/s, so that the oil injection speed is greater than the instantaneous speed of the piston, and the oil sprayed by the piston cooling nozzle 400 can smoothly enter a cold oil passage in the piston to realize oscillation cooling. When the power of the engine reaches the rated power, namely the opening of the electromagnetic valve 300 reaches the maximum value, the maximum oil injection speed of the piston cooling nozzle 400 under the condition that the oil pressure of the main oil gallery 100 is 4bar is not less than 17.9 m/s.
The embodiment of the invention also provides an engine, which comprises an oil pump 500 and a cylinder body, wherein the engine also comprises the piston cooling oil injection system provided by any embodiment of the invention, the main oil gallery 100 is connected with the oil pump 500, and the piston cooling nozzle 400 is connected with the cylinder body.
Furthermore, the engine also comprises an engine cooler and an engine oil temperature sensor, wherein the engine oil temperature sensor is connected with the oil inlet side of the engine cooler; the engine oil temperature sensor is used for sending a detected engine oil temperature signal to the controller, and the controller controls the opening degree of the electromagnetic valve 300 according to the engine oil temperature signal. Thus, the controller may control the opening of the solenoid valve 300 according to the real-time temperature of the oil, thereby improving the accuracy of oil injection to the piston cooling nozzle 400.
Further, the engine also comprises a water jacket and a water temperature sensor, wherein the water temperature sensor is arranged on the water jacket; the water temperature sensor is used for sending a detected water temperature signal to the controller, and the controller controls the opening degree of the electromagnetic valve 300 according to the water temperature signal. Therefore, the heat load of the engine can be reflected in real time according to the water temperature in the water jacket, so that the opening degree of the electromagnetic valve 300 can be controlled through the controller according to the real-time heat load of the engine, and the oil injection precision of the piston cooling nozzle 400 is improved.
The embodiment of the invention also provides an oil injection control method, which adopts the piston cooling oil injection system and the engine provided by any embodiment of the invention, wherein the method comprises the following steps:
step 1, detecting whether the power of the engine reaches the set power, and if so, entering step 2.
And 2, controlling the electromagnetic valve to open so that the piston cooling nozzle injects oil at a first flow rate.
And 3, detecting whether the power of the engine reaches the rated power, and if so, entering the step 4.
And 4, controlling the opening degree of the electromagnetic valve to be opened to the maximum value so that the piston cooling nozzle injects oil at a second flow rate.
The first flow rate is specifically obtained according to the following formula:
Q＝P′×0.08L/min
wherein Q represents a first flow rate, and P' represents a set power;
the second flow rate is specifically obtained according to the following formula:
Q＝P0×0.08L/min
wherein Q represents a first flow rate, P0Indicating the rated power.
Specifically, in the present embodiment, the rated power of the engine may be 95kW, and the set power of the engine may be 54 kW; when the set power of the engine reaches 54kW, the opening of the electromagnetic valve can be controlled, and the opening of the electromagnetic valve is adjusted, so that the first flow is controlled at 4.3L/min; and as the engine power continues to increase, the oil flow can be comprehensively controlled according to the engine power, the water temperature and the oil temperature. When the power of the engine reaches 95kW of rated power, the opening of the electromagnetic valve is controlled to be opened to the maximum value, and the maximum value is P according to a formula Q0× 0.08.08L/min can obtain the engine oil flow under the rated power, and the current flow is not less than 7.6L/min.
Further, step 1 may specifically include:
and 11, detecting whether the power of the engine reaches the set power, and if so, entering a step 12.
And step 12, detecting whether the temperature of the engine oil reaches the set oil temperature, and if so, entering step 13.
And step 13, detecting whether the water temperature of the engine reaches the set water temperature, and if so, entering step 2.
Therefore, the engine power, the engine oil temperature and the engine water temperature can be detected in a combined mode, the engine heat load can be accurately judged, and therefore oil injection control can be achieved according to the engine heat load.
According to the piston cooling oil injection system, the engine and the oil injection control method provided by the embodiment of the invention, the air oil passage and the electromagnetic valve are arranged, and the flow of the engine oil input into the piston cooling nozzle can be controlled by controlling the opening degree of the electromagnetic valve, so that the oil injection time and the oil injection quantity can be accurately controlled according to the heat load of the engine, and the piston is prevented from being excessively cooled.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (6)
1. A piston-cooled fuel injection system, comprising:
a main oil gallery connected with the oil pump;
the air oil duct is connected with the main oil duct;
the electromagnetic valve is respectively connected with the controller and the air oil channel;
the controller is used for controlling the opening of the electromagnetic valve;
the piston cooling nozzle is arranged on the air oil passage;
piston cooling nozzle is provided with a plurality ofly, and every piston cooling nozzle all is connected with a cylinder body in the engine, and is a plurality of piston cooling nozzle's internal diameter is by the cylinder body of the water inlet department that is close to the engine to keeping away from the direction of the cylinder body of water inlet department increases in proper order.
2. The piston-cooled oil injection system according to claim 1, wherein a maximum oil injection speed of the piston-cooled nozzle is not less than 13.2m/s under a condition that the main gallery oil pressure is 2.45 bar.
3. The piston-cooled oil injection system according to claim 1, wherein a maximum oil injection speed of the piston-cooled nozzle is not less than 17.9m/s under a condition that the main gallery oil pressure is 4 bar.
4. An engine comprising an oil pump and a cylinder block, characterized in that the engine further comprises a piston-cooled oil injection system according to any one of claims 1 to 3, the main oil gallery being connected to the oil pump, and the piston-cooled oil injection nozzle being connected to the cylinder block;
the water-cooling water heater further comprises a water jacket and a water temperature sensor, wherein the water temperature sensor is arranged on the water jacket;
the water temperature sensor is used for sending a detected water temperature signal to the controller, and the controller controls the opening of the electromagnetic valve according to the water temperature signal.
5. The engine of claim 4, further comprising an engine cooler and an oil temperature sensor, the oil temperature sensor being connected to an oil intake side of the engine cooler;
the engine oil temperature sensor is used for sending a detected engine oil temperature signal to the controller, and the controller controls the opening degree of the electromagnetic valve according to the engine oil temperature signal.
6. A method of controlling fuel injection using the piston-cooled fuel injection system of any one of claims 1 to 3 and the engine of claim 4 or 5, the method comprising the steps of:
step 11, detecting whether the power of the engine reaches a set power, and if so, entering step 12;
step 12, detecting whether the temperature of the engine oil reaches a set oil temperature, and if so, entering step 13;
step 13, detecting whether the water temperature of the engine reaches a set water temperature, and if so, entering step 2;
step 2, controlling the electromagnetic valve to open so that the piston cooling nozzle injects oil at a first flow rate;
step 3, detecting whether the power of the engine reaches the rated power, and if so, entering step 4;
step 4, controlling the opening degree of the electromagnetic valve to be opened to the maximum value so that the piston cooling nozzle injects oil at a second flow rate;
the first flow rate is specifically obtained according to the following formula:
Q＝P′×0.08L/min
wherein Q represents a first flow rate, and P' represents a set power;
the second flow rate is specifically obtained according to the following formula:
Q＝P0×0.08L/min
wherein Q represents a first flow rate, P0Indicating the rated power.
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| CN201811554556.XA CN109505691B (en) | 2018-12-18 | 2018-12-18 | Piston cooling oil injection system, engine and oil injection control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110761885A (en) * | 2019-12-03 | 2020-02-07 | 吉林大学 | Method and device for changing cooling flow of engine piston by random oil temperature |
| CN112761807B (en) * | 2021-02-08 | 2022-06-28 | 联合汽车电子有限公司 | Fault diagnosis method, piston cooling system and vehicle |
| CN114233461B (en) * | 2022-02-24 | 2022-04-29 | 潍坊力创电子科技有限公司 | Engine piston cooling control method |
| CN114810271B (en) * | 2022-05-11 | 2024-04-16 | 潍柴动力股份有限公司 | Control method for engine system and engine system |
| CN115234356B (en) * | 2022-08-19 | 2024-01-12 | 潍柴动力股份有限公司 | Electric control piston cooling nozzle and control method |
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| DE102004010361A1 (en) * | 2003-03-05 | 2004-12-30 | Otte, Dirk | Counter piston engine with piston temperature equalization function relocates thermal load in engine by combustion procedure for bearing of inlet piston in engine to equalize piston temperature |
| GB2428452B (en) * | 2005-07-20 | 2011-02-23 | Ford Global Tech Llc | Oil spray system for an internal combustion engine |
| CN102705035A (en) * | 2012-06-01 | 2012-10-03 | 浙江吉利汽车研究院有限公司杭州分公司 | Engine lubricating system and engine lubricating method |
| CN103790688B (en) * | 2014-01-21 | 2017-11-10 | 潍柴动力股份有限公司 | The control method of a kind of engine and its cooling nozzles, control system |
| CN204060840U (en) * | 2014-06-17 | 2014-12-31 | 上海汽车集团股份有限公司 | Engine lubrication system |
| CN207064087U (en) * | 2017-07-01 | 2018-03-02 | 重庆长安汽车股份有限公司 | A kind of engine cylinder-body oil duct structure |
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