Control strategy for reducing engine oil consumption of engine

Abstract

The invention discloses a control strategy for reducing engine oil consumption of an engine, and relates to the technical field of engines. The air inlet pressure in the engine cylinder is calculated by collecting the air inlet pressure behind the throttle valve and the local atmospheric pressure in real time, the air inlet pressure level in the cylinder can be accurately judged, whether the engine oil burning risk exists or not is recognized, when the negative pressure duration time in the engine cylinder exceeds the preset time threshold value, it is indicated that the engine oil burning risk exists, and the engine oil burning risk is judged. At the moment, the throttle valve is actively controlled to be opened, engine air inlet positive pressure is maintained, the situation that a large amount of engine oil flows upwards due to long-time negative pressure in an engine cylinder is reduced, and therefore engine oil burning faults of the engine are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and more specifically, to a control strategy for reducing engine oil consumption. Background Art

[0002] During engine operation, the throttle is closed to increase the after-treatment temperature due to thermal management requirements. However, if the throttle remains too closed for a long time, negative pressure will form in the cylinder. In this case, the oil will flow from the piston ring into the cylinder, causing the engine to have abnormally high oil consumption. Summary of the invention

[0003] In order to overcome the defects of the prior art, the present invention proposes a control strategy for reducing the engine oil consumption. By monitoring the duration of continuous negative pressure in the engine cylinder, the throttle switch is controlled to maintain the positive intake pressure, thereby avoiding the oil in the cylinder from rising due to long-term negative pressure, causing a high oil consumption malfunction.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] The present invention provides a control strategy for reducing engine oil consumption, comprising the following steps:

[0006] S1. During vehicle operation, the controller reads the value of the engine throttle intake pressure P at the current time node. i1 , and the local real-time atmospheric pressure value P j1 , and record the current time as t1;

[0007] S2. Calculate the engine cylinder intake pressure ΔP1=P according to the read data i1 -P j1 ;

[0008] S3. Determine whether ΔP1 is a negative value:

[0009] If ΔP1≥0, return to step S1;

[0010] If ΔP1<0, go to step S4;

[0011] S4: The controller reads the value of the engine throttle intake pressure P at the next time node. i(n+1) , and the local real-time atmospheric pressure value P j(n+1) , and record the current time as t (n+1) , where n is the number of cycles, and n≥1;

[0012] S5. Calculate the engine cylinder intake pressure ΔP based on the read data (n+1) =P i(n+1) -P j(n+1) ;

[0013] S6. Determine ΔP (n+1) Is it a negative value?

[0014] If ΔP (n+1) ≥0, return to step S1;

[0015] If ΔP (n+1) <0, then go to step S7;

[0016] S7. Calculate the duration of the continuous negative pressure in the engine cylinder as ΔT n =t (n+1) -t1;

[0017] S8, ΔT n Compare with the preset engine cylinder continuous negative pressure time limit T:

[0018] If ΔT n <T, then return to step S2, and n=n+1;

[0019] If ΔT n ≥T, the throttle valve is controlled to open.

[0020] In a preferred technical solution of the present invention, the controller is an ECU processor.

[0021] In a preferred technical solution of the present invention, the time interval between any two adjacent time nodes is equal.

[0022] The beneficial effects of the present invention are:

[0023] 1. A control strategy for reducing engine oil consumption proposed in the present invention calculates the intake pressure in the engine cylinder by collecting the intake pressure after the throttle and the local atmospheric pressure in real time. It can accurately determine the intake pressure level in the engine cylinder and identify whether there is a risk of burning oil. When the continuous negative pressure time in the engine cylinder exceeds the preset time threshold, it indicates that there is a risk of burning oil. At this time, the throttle is actively controlled to open to maintain the positive intake pressure of the engine, reduce the oil rushing in the engine cylinder due to negative pressure, and thus avoid the engine from burning oil failure.

[0024] 2. The control strategy for reducing engine oil consumption proposed by the present invention is simple and easy to implement, and directly uses existing sensors to realize logical calculations without adding additional hardware equipment, and has high practicality and economy.

[0025] 3. The control strategy for reducing engine oil consumption proposed in the present invention can promptly handle abnormal engine operation, promptly judge and actively open the throttle, effectively avoid the situation where the engine cylinder is under negative pressure for a long time, avoid abnormal oil consumption, and improve engine reliability.

[0026] 4. The control strategy for reducing engine oil consumption proposed in the present invention is suitable for engines using a throttle, and can accurately detect and control the intake pressure in the engine cylinder under different environmental conditions, and has wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of a control strategy for reducing engine oil consumption provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0029] like Figure 1 As shown, an embodiment provides a control strategy for reducing engine oil consumption, including the following steps:

[0030] S1. During vehicle operation, the controller reads the value of the engine throttle intake pressure P at the current time node. i1 , and the local real-time atmospheric pressure value P j1 , and record the current time as t1;

[0031] S2, the controller reads P i1 , P j1 Data calculation engine cylinder intake pressure ΔP1 = P i1 -P j1 ;

[0032] S3. Determine whether ΔP1 is a negative value:

[0033] If ΔP1≥0, return to step S1;

[0034] If ΔP1<0, go to step S4;

[0035] S4: The controller reads the value of the engine throttle intake pressure P at the next time node. i(n+1) , and the local real-time atmospheric pressure value P j(n+1) , and record the current time as t (n+1) , where n is the number of cycles, and n≥1;

[0036] S5, the controller reads P i(n+1) , P j(n+1) Data calculation of engine cylinder intake pressure ΔP (n+1) =P i(n+1) -P j(n+1) ;

[0037] S6. Determine ΔP (n+1) Is it a negative value?

[0038] If ΔP (n+1) ≥0, return to step S1;

[0039] If ΔP (n+1) <0, then go to step S7;

[0040] S7, the controller calculates the duration of the continuous negative pressure in the engine cylinder as ΔT n =t (n+1) -t1;

[0041] S8, ΔT n Compare with the preset engine cylinder continuous negative pressure time limit T:

[0042] If ΔT n <T, then return to step S2, and n=n+1;

[0043] If ΔT n ≥T, the throttle valve is controlled to open.

[0044] Specifically, the controller is an ECU processor. In this embodiment, the ECU processor is a prior art and will not be described in detail here.

[0045] Specifically, the time interval between any two adjacent time nodes is equal.

[0046] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A control strategy for reducing engine oil consumption, characterized in that: The steps include: S1. During vehicle operation, the controller reads the value of the engine throttle intake pressure P at the current time node. i1 , and the local real-time atmospheric pressure value P j1 , and record the current time as t1; S2. Calculate the engine cylinder intake pressure ΔP1=P according to the read data i1 -P j1 ; S3. Determine whether ΔP1 is a negative value: If ΔP1≥0, return to step S1; If ΔP1<0, go to step S4; S4: The controller reads the value of the engine throttle intake pressure P at the next time node. i(n+1) , and the local real-time atmospheric pressure value P j(n+1) , and record the current time as t (n+1) , where n is the number of cycles, and n≥1; S5. Calculate the engine cylinder intake pressure ΔP based on the read data (n+1) =P i(n+1) -P j(n+1) ; S6. Determine ΔP (n+1) Is it a negative value? If ΔP (n+1) ≥0, return to step S1; If ΔP (n+1) <0, then go to step S7; S7. Calculate the duration of the continuous negative pressure in the engine cylinder as ΔT n =t (n+1) -t1; S8, ΔT n Compare with the preset engine cylinder continuous negative pressure time limit T: If ΔT n <T, then return to step S2, and n=n+1; If ΔT n ≥T, the throttle valve is controlled to open.

2. A control strategy for reducing engine oil consumption according to claim 1, characterized in that: The controller is an ECU processor.

3. A control strategy for reducing engine oil consumption according to claim 1, characterized in that: The time interval between any two adjacent time nodes is equal.

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