CN112832893B - Control method and device for electric control piston cooling nozzle - Google Patents
Control method and device for electric control piston cooling nozzle Download PDFInfo
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- CN112832893B CN112832893B CN201911166196.0A CN201911166196A CN112832893B CN 112832893 B CN112832893 B CN 112832893B CN 201911166196 A CN201911166196 A CN 201911166196A CN 112832893 B CN112832893 B CN 112832893B
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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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- 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
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of engines, in particular to a method and a device for controlling an electric control piston cooling nozzle, wherein the method comprises the following steps: acquiring the current working state of the engine, wherein the current working state is determined by the current rotating speed of the engine and the current torque of the engine; judging whether the current working state meets one of preset working states, wherein the preset working states comprise a first preset working state, a second preset working state, a third preset working state or a fourth preset working state; when the current working state meets one of the preset working states, taking corresponding control measures of the piston cooling nozzle according to the preset working state, wherein the control measures comprise: closing the piston cooling nozzle, intermittently opening the piston cooling nozzle, or completely opening the piston cooling nozzle; according to the invention, the working mode of the piston cooling nozzle is controlled according to the rotating speed and the torque of the engine, the working mode of the clearance of the piston cooling nozzle is increased, the energy conservation and emission reduction are realized, and the cost performance is improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a device for controlling an electric control piston cooling nozzle.
Background
With the increasing environmental pollution, the national requirements on the emission and oil consumption of automobiles become stricter, and a plurality of energy-saving and emission-reducing methods are available in the automobile industry, wherein the energy-saving and emission-reducing technology of the electric control piston cooling nozzle is more and more widely applied.
The cooling nozzle is generally fixedly arranged on an oil passage of the engine, and in the running process of the engine, the cooling nozzle sprays cooling oil to a piston, and the cooling oil with lower temperature takes away heat of the piston through heat exchange to cool the piston.
In the existing control method for the cooling nozzle of the engine, a control valve is arranged between the cooling nozzle and an auxiliary oil duct, and the oil injection quantity of the cooling nozzle is controlled by adjusting the opening size of the control valve. In the control process, firstly, the engine oil pressure of the main oil duct of the engine is detected, the larger the pressure is, the more heat generated by the engine is represented, the larger the opening of the control valve is adjusted, and the oil injection quantity of the cooling nozzle is larger; the smaller the oil pressure of the main oil duct is, the less heat generated by the engine is, the smaller the opening of the regulating control valve is, and the smaller the oil injection quantity of the cooling nozzle is.
In the prior art, the opening and closing of the piston cooling nozzle are controlled through the rotating speed, the load or the power, the closing area of the piston cooling nozzle is small due to the consideration of the engine knocking factor, the cost performance is low, the opening and closing time of the piston cooling nozzle cannot be determined according to the working condition of the engine, the waste of oil consumption of the engine is caused, the emission is increased, and the energy conservation and emission reduction cannot be realized.
Based on the above analysis, controlling the effective opening and closing of the piston cooling nozzles is a problem that needs to be addressed by those skilled in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a control method and a control device for an electric control piston cooling nozzle, which are used for controlling the working mode of the piston cooling nozzle according to the rotating speed and the torque of an engine, increasing the gap working mode of the piston cooling nozzle, realizing energy conservation and emission reduction and improving the cost performance.
In order to solve the above problems, the present invention provides a method for controlling an electronically controlled piston cooling nozzle, comprising the steps of:
acquiring a current working state of the engine, wherein the current working state is determined by the current rotating speed of the engine and the current torque of the engine;
judging whether the current working state meets one of preset working states, wherein the preset working states comprise a first preset working state, a second preset working state, a third preset working state and a fourth preset working state;
when the current working state meets one of the preset working states, taking corresponding control measures of the piston cooling nozzle according to the preset working state, wherein the control measures comprise: closing the piston cooling nozzle, intermittently opening the piston cooling nozzle, and completely opening the piston cooling nozzle.
Further, when the current working state meets one of the preset working states, taking control measures of the corresponding piston cooling nozzle according to the preset working state comprises:
when the current working state meets the first preset working state, closing the piston cooling nozzle;
when the current working state meets the second preset working state, intermittently opening the piston cooling nozzle according to first preset time;
when the current working state meets the third preset working state, intermittently opening the piston cooling nozzle according to second preset time;
and when the current working state meets the fourth preset working state, completely opening the piston cooling nozzle.
Further, the first preset working state is determined by a first preset rotating speed and a first preset torque together, the range of the first preset rotating speed is 2700-2900 rpm, and the range of the first preset torque is 90-110 N.m.
Further, the second preset working state is determined by a second preset rotating speed and a second preset torque together, the range of the second preset rotating speed is 3200-3400 rpm, and the range of the second preset torque is 120-130 N.m.
Further, the third preset working state is determined by a third preset rotating speed and a third preset torque, the range of the third preset rotating speed is 3700-3900 rpm, and the range of the third preset torque is 140-160N-m.
Further, the fourth preset working state is determined by a fourth preset rotating speed and a fourth preset torque together, the range of the fourth preset rotating speed is 5500-5700 rpm, and the range of the fourth preset torque is 340-360N-m.
Further, the first preset time includes a first preset on time and a first preset off time, the first preset on time ranges from 12 s to 18s, and the first preset off time ranges from 28 s to 32 s.
Further, the second preset time includes a second preset opening time and a second preset closing time, the second preset opening time ranges from 28 s to 32s, and the second preset closing time ranges from 12 s to 18 s.
The invention also protects a control device of the electric control piston cooling nozzle, which comprises:
the acquisition module is used for acquiring the current working state of the engine, and the current working state is determined by the current rotating speed of the engine and the current torque of the engine;
the judging module is used for judging whether the current working state meets one of preset working states, wherein the preset working states comprise a first preset working state, a second preset working state, a third preset working state and a fourth preset working state;
an execution module, configured to, when the current operating state satisfies one of the preset operating states, take a control measure of a corresponding piston cooling nozzle according to the preset operating state, where the control measure includes: closing the piston cooling nozzle, intermittently opening the piston cooling nozzle, and completely opening the piston cooling nozzle.
Further, the execution module includes:
the first execution unit is used for closing the piston cooling nozzle when the current working state meets the first preset working state;
the second execution unit is used for intermittently opening the piston cooling nozzle according to first preset time when the current working state meets the second preset working state;
the third execution unit is used for intermittently opening the piston cooling nozzle according to second preset time when the current working state meets the third preset working state;
and the fourth execution unit is used for completely opening the piston cooling nozzle when the current working state meets the fourth preset working state.
Due to the technical scheme, the invention has the following beneficial effects:
1) according to the control method and the control device for the electrically-controlled piston cooling nozzle, the working mode of the piston cooling nozzle is controlled according to the rotating speed and the torque of an engine, so that energy conservation and emission reduction are realized, and the cost performance is improved;
2) according to the control method and device for the electrically-controlled piston cooling nozzle, the gap working mode of the piston cooling nozzle is increased, the opening and closing time of the gap working mode is controlled, the closing area of the cooling nozzle is maximized, the oil consumption is further reduced, the energy conservation and emission reduction are realized, and the cost performance is improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a flow chart of a method of controlling an electronically controlled piston cooling nozzle provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control arrangement for an electronically controlled piston cooling nozzle provided in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram of an execution module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
Example one
The embodiment provides a control method of an electrically-controlled piston cooling nozzle, as shown in fig. 1, comprising the following steps:
s101, obtaining a current working state of an engine, wherein the current working state is determined by the current rotating speed of the engine and the current torque of the engine;
s102, judging whether the current working state meets one of preset working states, wherein the preset working states comprise a first preset working state, a second preset working state, a third preset working state and a fourth preset working state;
s103, when the current working state meets one of the preset working states, taking corresponding control measures of the piston cooling nozzle according to the preset working state, wherein the control measures comprise: closing the piston cooling nozzle, intermittently opening the piston cooling nozzle, and completely opening the piston cooling nozzle.
Further, when the current working state meets one of the preset working states, taking control measures of the corresponding piston cooling nozzle according to the preset working state comprises:
when the current working state meets the first preset working state, closing the piston cooling nozzle;
when the current working state meets the second preset working state, intermittently opening the piston cooling nozzle according to first preset time;
when the current working state meets the third preset working state, intermittently opening the piston cooling nozzle according to second preset time;
and when the current working state meets the fourth preset working state, completely opening the piston cooling nozzle.
Specifically, when the current working state meets the first preset working state, the current rotating speed is smaller than the first preset rotating speed, and meanwhile, the current torque is smaller than the first preset torque.
Further, the first preset working state is determined by a first preset rotating speed and a first preset torque together, the range of the first preset rotating speed is 2700-2900 rpm, and the range of the first preset torque is 90-110 N.m.
Preferably, the first preset rotation speed is 2800rpm and the first preset torque is 100N · m.
Specifically, when the current operating state satisfies the second preset operating state, the current rotating speed is greater than the first preset rotating speed and less than the second preset rotating speed, and meanwhile, the current torque is greater than the first preset torque and less than the second preset torque.
Further, the second preset working state is determined by a second preset rotating speed and a second preset torque together, the range of the second preset rotating speed is 3200-3400 rpm, and the range of the second preset torque is 120-130 N.m.
Preferably, the second preset rotation speed is 3300rpm, and the second preset torque is 120N · m.
Specifically, when the current operating state satisfies the third preset operating state, the current rotating speed is greater than the second preset rotating speed and less than the third preset rotating speed, and meanwhile, the current torque is greater than the second preset torque and less than the third preset torque.
Further, the third preset working state is determined by a third preset rotating speed and a third preset torque, the range of the third preset rotating speed is 3700-3900 rpm, and the range of the third preset torque is 140-160N-m.
Preferably, the third preset rotation speed is 3800rpm, and the third preset torque is 150N · m.
Specifically, when the current operating state satisfies the fourth preset operating state, the current rotating speed is greater than the third preset rotating speed and less than the fourth preset rotating speed, and meanwhile, the current torque is greater than the third preset torque and less than the fourth preset torque.
Further, the fourth preset working state is determined by a fourth preset rotating speed and a fourth preset torque together, the range of the fourth preset rotating speed is 5500-5700 rpm, and the range of the fourth preset torque is 340-360N-m.
Preferably, the fourth preset rotation speed is 5500rpm, and the fourth preset torque is 350N · m.
Specifically, the first preset time includes a first preset opening time and a first preset closing time, the first preset opening time ranges from 12 s to 18s, and the first preset closing time ranges from 28 s to 32 s.
Preferably, the first preset on-time is 15s and the first preset off-time is 30 s.
Further, the second preset time includes a second preset on time and a second preset off time, the second preset on time ranges from 28 s to 32s, and the second preset off time ranges from 12 s to 18 s.
Preferably, the second preset on-time is 30s and the second preset off-time is 15 s.
The present embodiment further provides a control device for an electronically controlled piston cooling nozzle, as shown in fig. 2, including:
the system comprises an obtaining module 10, a judging module and a control module, wherein the obtaining module is used for obtaining the current working state of an engine, and the current working state is jointly determined by the current rotating speed of the engine and the current torque of the engine;
the judging module 20 is configured to judge whether the current working state meets one of preset working states, where the preset working states include a first preset working state, a second preset working state, a third preset working state, and a fourth preset working state;
an executing module 30, configured to, when the current operating state meets one of the preset operating states, take a corresponding control measure of the piston cooling nozzle according to the preset operating state, where the control measure includes: closing the piston cooling nozzle, intermittently opening the piston cooling nozzle, and completely opening the piston cooling nozzle.
As shown in fig. 3, the execution module 30 includes:
the first execution unit 301 is used for closing the piston cooling nozzle when the current working state meets the first preset working state;
the second execution unit 302 is configured to intermittently open the piston cooling nozzle according to a first preset time when the current working state meets the second preset working state;
a third executing unit 303, configured to intermittently open the piston cooling nozzle according to a second preset time when the current working state meets the third preset working state;
a fourth executing unit 304, configured to fully open the piston cooling nozzle when the current operating state meets the fourth preset operating state.
Specifically, when the current working state meets the first preset working state, the current rotating speed is smaller than the first preset rotating speed, and meanwhile, the current torque is smaller than the first preset torque.
Further, the first preset working state is determined by a first preset rotating speed and a first preset torque together, the range of the first preset rotating speed is 2700-2900 rpm, and the range of the first preset torque is 90-110 N.m.
Preferably, the first preset rotation speed is 2800rpm and the first preset torque is 100N · m.
Specifically, when the current operating state satisfies the second preset operating state, the current rotating speed is greater than the first preset rotating speed and less than the second preset rotating speed, and meanwhile, the current torque is greater than the first preset torque and less than the second preset torque.
Further, the second preset working state is determined by a second preset rotating speed and a second preset torque together, the range of the second preset rotating speed is 3200-3400 rpm, and the range of the second preset torque is 120-130 N.m.
Preferably, the second preset rotation speed is 3300rpm, and the second preset torque is 120N · m.
Specifically, when the current operating state satisfies the third preset operating state, the current rotating speed is greater than the second preset rotating speed and less than the third preset rotating speed, and meanwhile, the current torque is greater than the second preset torque and less than the third preset torque.
Further, the third preset working state is determined by a third preset rotating speed and a third preset torque, the range of the third preset rotating speed is 3700-3900 rpm, and the range of the third preset torque is 140-160N-m.
Preferably, the third preset rotation speed is 3800rpm, and the third preset torque is 150N · m.
Specifically, when the current operating state satisfies the fourth preset operating state, the current rotating speed is greater than the third preset rotating speed and less than the fourth preset rotating speed, and meanwhile, the current torque is greater than the third preset torque and less than the fourth preset torque.
Further, the fourth preset working state is determined by a fourth preset rotating speed and a fourth preset torque together, the range of the fourth preset rotating speed is 5500-5700 rpm, and the range of the fourth preset torque is 340-360N-m.
Preferably, the fourth preset rotation speed is 5500rpm, and the fourth preset torque is 350N · m.
Specifically, the first preset time includes a first preset opening time and a first preset closing time, the first preset opening time ranges from 12 s to 18s, and the first preset closing time ranges from 28 s to 32 s.
Preferably, the first preset on-time is 15s and the first preset off-time is 30 s.
Further, the second preset time includes a second preset opening time and a second preset closing time, the second preset opening time ranges from 28 s to 32s, and the second preset closing time ranges from 12 s to 18 s.
Preferably, the second preset on-time is 30s and the second preset off-time is 15 s.
The embodiment provides a control method and a control device for an electronic control piston cooling nozzle, which control the working mode of the piston cooling nozzle according to the rotating speed and the torque of an engine, increase the working mode of the clearance of the piston cooling nozzle, realize energy conservation and emission reduction, and improve the cost performance.
It is noted that while for simplicity of explanation, the foregoing method embodiments have been presented as a series of interrelated states or acts, it should be appreciated by those skilled in the art that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Similarly, the modules of the control device for electrically controlling the piston cooling nozzle are computer programs or program segments for performing one or more specific functions, and the distinction between the modules does not mean that the actual program code is also separate. Further, the above embodiments may be arbitrarily combined to obtain other embodiments.
In the foregoing embodiments, the descriptions of the embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment. Those of skill in the art will further appreciate that the various illustrative logical blocks, units, and steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate the interchangeability of hardware and software, various illustrative components, elements, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (9)
1. A control method of an electric control piston cooling nozzle is characterized by comprising the following steps:
acquiring a current working state of the engine, wherein the current working state is determined by the current rotating speed of the engine and the current torque of the engine;
judging whether the current working state meets one of preset working states, wherein the preset working states comprise a first preset working state, a second preset working state, a third preset working state and a fourth preset working state;
when the current working state meets one of the preset working states, taking corresponding control measures of the piston cooling nozzle according to the preset working state, wherein the control measures comprise: closing the piston cooling nozzle, intermittently opening the piston cooling nozzle, and completely opening the piston cooling nozzle;
when the current working state meets the first preset working state, closing the piston cooling nozzle;
when the current working state meets the second preset working state, intermittently opening the piston cooling nozzle according to first preset time;
when the current working state meets the third preset working state, intermittently opening the piston cooling nozzle according to second preset time;
and when the current working state meets the fourth preset working state, completely opening the piston cooling nozzle.
2. The method as claimed in claim 1, wherein the first predetermined operating condition is determined by a first predetermined rotational speed and a first predetermined torque, the first predetermined rotational speed is in a range of 2700-2900 rpm, and the first predetermined torque is in a range of 90-110N-m.
3. The method for controlling the electronically controlled piston cooling nozzle as recited in claim 1, wherein the second predetermined operating condition is determined by a second predetermined rotational speed and a second predetermined torque, the second predetermined rotational speed is in a range of 3200 to 3400rpm, and the second predetermined torque is in a range of 120 to 130N · m.
4. The method of claim 1, wherein the third predetermined operating condition is determined by a third predetermined rotational speed and a third predetermined torque, the third predetermined rotational speed is in a range of 3700-3900 rpm, and the third predetermined torque is in a range of 140-160N-m.
5. The method as claimed in claim 1, wherein the fourth predetermined operating state is determined by a fourth predetermined rotational speed and a fourth predetermined torque, the fourth predetermined rotational speed is in a range of 5500-5700 rpm, and the fourth predetermined torque is in a range of 340-360N-m.
6. The method as claimed in claim 1, wherein the first predetermined time includes a first predetermined opening time and a first predetermined closing time, the first predetermined opening time is in a range of 12-18 s, and the first predetermined closing time is in a range of 28-32 s.
7. The method of claim 1, wherein the second predetermined time comprises a second predetermined on time and a second predetermined off time, the second predetermined on time is in a range of 28-32 s, and the second predetermined off time is in a range of 12-18 s.
8. A control apparatus for an electronically controlled piston cooling nozzle, comprising:
the acquisition module is used for acquiring the current working state of the engine, and the current working state is determined by the current rotating speed of the engine and the current torque of the engine;
the judging module is used for judging whether the current working state meets one of preset working states, wherein the preset working states comprise a first preset working state, a second preset working state, a third preset working state and a fourth preset working state;
the execution module is used for taking control measures of the corresponding piston cooling nozzle according to the preset working state when the current working state meets one of the preset working states, and the control measures comprise: closing the piston cooling nozzle, intermittently opening the piston cooling nozzle, and completely opening the piston cooling nozzle, and closing the piston cooling nozzle when the current working state meets the first preset working state; when the current working state meets the second preset working state, intermittently opening the piston cooling nozzle according to first preset time; when the current working state meets the third preset working state, intermittently opening the piston cooling nozzle according to second preset time; and when the current working state meets the fourth preset working state, completely opening the piston cooling nozzle.
9. The control device of an electronically controlled piston cooling nozzle of claim 8, wherein said actuator module comprises:
the first execution unit is used for closing the piston cooling nozzle when the current working state meets the first preset working state;
the second execution unit is used for intermittently opening the piston cooling nozzle according to first preset time when the current working state meets the second preset working state;
the third execution unit is used for intermittently opening the piston cooling nozzle according to second preset time when the current working state meets the third preset working state;
and the fourth execution unit is used for completely opening the piston cooling nozzle when the current working state meets the fourth preset working state.
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| CN201911166196.0A CN112832893B (en) | 2019-11-25 | 2019-11-25 | Control method and device for electric control piston cooling nozzle |
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| CN201911166196.0A CN112832893B (en) | 2019-11-25 | 2019-11-25 | Control method and device for electric control piston cooling nozzle |
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| 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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|---|---|---|---|---|
| GB2428452A (en) * | 2005-07-20 | 2007-01-31 | Ford Global Tech Llc | Oil spray system for cooling pistons in i.c. engines |
| DE102007060160A1 (en) * | 2007-12-13 | 2009-06-18 | Ford Global Technologies, LLC, Dearborn | Strategy for activating oil injection at an internal combustion motor, to cool the pistons, verifies four conditions for oil injection only when required |
| CN105649747A (en) * | 2016-01-06 | 2016-06-08 | 潍柴动力股份有限公司 | Electronically controlled piston cooling nozzle control method and system |
| CN106481429A (en) * | 2015-08-28 | 2017-03-08 | 长城汽车股份有限公司 | A kind of piston cooling nozzle control method and control system |
| CN109236402A (en) * | 2018-10-29 | 2019-01-18 | 台州吉利罗佑发动机有限公司 | Control method and system for grease pump |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2428452A (en) * | 2005-07-20 | 2007-01-31 | Ford Global Tech Llc | Oil spray system for cooling pistons in i.c. engines |
| DE102007060160A1 (en) * | 2007-12-13 | 2009-06-18 | Ford Global Technologies, LLC, Dearborn | Strategy for activating oil injection at an internal combustion motor, to cool the pistons, verifies four conditions for oil injection only when required |
| CN106481429A (en) * | 2015-08-28 | 2017-03-08 | 长城汽车股份有限公司 | A kind of piston cooling nozzle control method and control system |
| CN105649747A (en) * | 2016-01-06 | 2016-06-08 | 潍柴动力股份有限公司 | Electronically controlled piston cooling nozzle control method and system |
| CN109236402A (en) * | 2018-10-29 | 2019-01-18 | 台州吉利罗佑发动机有限公司 | Control method and system for grease pump |
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