阅读说明：本技术 一种机油预供泵润滑控制方法 (Lubricating control method for machine oil pre-supply pump ) 是由 金钊 刘成龙 武玉臣 魏祥波 于 2021-09-30 设计创作，主要内容包括：本发明公开了一种机油预供泵润滑控制方法,包括ECU上电且发动机未启动时可选择执行的自动周期性润滑步骤；包括S11、判断机油压力是否达到标定润滑阈值,否执行S12,是执行S13；S12、预供泵工作并计时；在设定时间阈值内机油压力未达到标定润滑阈值,继续润滑、计时；在设定时间阈值内机油压力达到标定润滑阈值,计时清零并执行S13；计时时间达到设定时间阈值但机油压力未达到标定润滑阈值,报预供泵故障、停止润滑、计时清零；S13、预供泵不工作,不工作时间达到周期时间阈值时返回S12。本发明可确保处于不同工况的发动机都能在启动时得到润滑,防止发动机出现拉缸、化瓦等现象,提高了发动机的可靠性和使用寿命。(The invention discloses a lubrication control method of an engine oil pre-supply pump, which comprises an automatic periodic lubrication step which can be selectively executed when an ECU is electrified and an engine is not started; s11, judging whether the oil pressure reaches a calibrated lubrication threshold value, if not, executing S12, and if so, executing S13; s12, pre-feeding the pump to work and timing; when the oil pressure does not reach the calibrated lubrication threshold value within the set time threshold value, continuing lubricating and timing; when the oil pressure reaches the calibrated lubrication threshold value within the set time threshold value, the timing is cleared and S13 is executed; when the timing time reaches a set time threshold value but the engine oil pressure does not reach a calibrated lubrication threshold value, predicting a fault of a supply pump, stopping lubrication and timing zero clearing; and S13, the pre-supply pump does not work, and the operation returns to S12 when the non-operation time reaches the cycle time threshold. The invention can ensure that the engines under different working conditions can be lubricated when being started, prevent the phenomena of cylinder pulling, tile changing and the like of the engines, and improve the reliability and the service life of the engines.)

1. The lubricating control method of the engine oil pre-feeding pump is characterized by comprising an automatic periodic lubricating step which can be selected to be executed when an ECU is electrified and an engine is not started; the automatic periodic lubrication step comprises:

s11, the ECU judges whether the current engine oil pressure P reaches a calibrated lubrication threshold value A, if not, the step S12 is executed, and if yes, the step S13 is directly executed;

s12, pre-supplying the pump to work, and timing by a first timer T1; when the ECU determines that the timing time T1 does not reach the set time threshold B and the engine oil pressure P does not reach the calibrated lubrication threshold A, the pre-supply pump continues to work, and the first timer T1 continues to time; when the ECU determines that the timing time T1 reaches a set time threshold B but the engine oil pressure P does not reach a calibrated lubrication threshold A, predicting the fault of a supply pump, stopping lubrication and resetting a first timer T1; when the ECU determines that the engine oil pressure P reaches the calibrated lubrication threshold value A but the timing time T1 does not reach the set time threshold value B, the first timer T1 is cleared and the step S13 is executed;

and S13, keeping the pre-supply pump out of work or stopping work, timing by the second timer T2, clearing the second timer T2 when the timing time T2 reaches the cycle time threshold value C, and returning to execute the step S12.

2. The method of claim 1, wherein when the ECU is powered on and the engine is not started, the ECU switches the current lubrication mode to the automatic periodic lubrication mode and starts to perform the automatic periodic lubrication step after a manual automatic lubrication switch electrically connected to the ECU is manually selected and pressed.

3. The method for controlling lubrication of an oil pre-pump according to claim 1, wherein step S12 specifically includes:

s121, the pre-supply pump works, and a first timer T1 times;

s122, the ECU judges whether the engine oil pressure P reaches the calibrated lubrication threshold value A again, if so, the first timer T1 is cleared and the step S13 is executed; if not, go to step S123;

s123, the ECU judges whether the timing time t1 reaches a set time threshold B, if so, the step S124 is executed; if not, returning to execute the step S122;

s124, predicting the fault of the pump, stopping lubrication and clearing a first timer T1.

4. The method for controlling lubrication of an oil pre-pump according to claim 1, wherein step S12 specifically includes:

s12a, operating the pre-supply pump, and timing by a first timer T1;

S12B, the ECU judges whether the engine oil pressure P reaches a calibrated lubrication threshold value A or not, and simultaneously judges whether the timing time t1 reaches a set time threshold value B or not; when the timing time t1 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, returning to continue executing the step S12 a; when the timing time t1 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S12 c; when the engine oil pressure P reaches the calibrated lubrication threshold A but the timing time t1 does not reach the set time threshold B, executing a step S12 d;

s12c, predicting the fault of a supply pump, stopping lubrication and clearing a first timer T1;

s12d, the first timer T1 is cleared and step S13 is executed.

5. The method of claim 1, wherein the predetermined time threshold B is stored in advance in the ECU; the calibration method comprises the following steps:

firstly, calibrating the time t required for increasing the engine oil pressure P from zero to a calibrated lubrication threshold value A when the pre-feeding pump works normally through a bench test; then, a set time threshold B greater than time t is calibrated.

6. The method of claim 1 further comprising the step of manual lubrication that is selectively performed when the ECU is powered up and the engine is not started; the manual lubrication step includes:

s21, pressing the manual lubricating switch, and observing the engine oil pressure value displayed by the instrument beside the engine in real time;

s22, manually judging whether the engine oil pressure P reaches a calibrated lubrication threshold value A, if so, loosening a manual lubrication switch, and stopping the operation of the pre-supply pump; if not, go to step S23;

and S23, keeping the pressing state of the manual lubrication switch, enabling the pre-supply pump to continue working, reporting an error when the ECU determines that the continuous working time reaches a set time threshold B but the engine oil pressure P does not reach a calibrated lubrication threshold A, and simultaneously cutting off a power supply loop of the pre-supply pump to force the pre-supply pump to stop working.

7. The oil pre-pump lubrication control method according to claim 1, further comprising:

when the ECU is powered on and an engine emergency starting mode is activated, the pre-supply pump stops working or is ensured not to work, and meanwhile, the starter acts, and the engine is started emergently.

8. The oil pre-pump lubrication control method according to claim 7, wherein the engine emergency start mode is activated by continuously pressing an engine start switch for a set period of time; alternatively, the engine emergency start mode is activated by pressing an engine emergency start switch.

9. The method of claim 1, further comprising the step of powering up the ECU and activating normal lubrication when the engine is in a normal start mode:

the normal lubrication step includes:

s31, the ECU judges whether the current engine oil pressure P reaches a calibrated lubrication threshold value A, if not, the step S32 is executed, and if yes, the step S34 is directly executed;

s32, the pre-supply pump works, and a third timer T3 times; when the timing time T3 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, the pre-supply pump continues to work, and the third timer T3 continues to time; when the timing time t3 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S33; when the engine oil pressure P reaches the calibrated lubrication threshold A but the timing time T1 does not reach the set time threshold B, clearing the third timer T3 and executing the step S34;

s33, predicting the fault of a supply pump, stopping lubrication, clearing a third timer T3, prohibiting the action of a starter and not starting an engine;

and S34, keeping the pre-supply pump out of work or stopping work, and simultaneously, actuating the starter to normally start the engine.

10. The method for controlling lubrication of an oil pre-pump according to claim 9, wherein step S32 specifically includes:

s321, the pre-supply pump works, and a third timer T3 times;

s322, judging whether the engine oil pressure P reaches the calibrated lubrication threshold value A again by the ECU, if so, clearing the third timer T13 and executing the step S34; if not, executing step S323;

s323, the ECU judges whether the timing time t3 reaches a set time threshold B, if so, the step S33 is executed; if not, returning to execute the step S322;

alternatively, step S32 specifically includes:

s32a, the pre-supply pump works, and a third timer T3 times;

S32B, the ECU judges whether the engine oil pressure P reaches a calibrated lubrication threshold value A or not, and simultaneously judges whether the timing time t3 reaches a set time threshold value B or not;

when the timing time t3 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, returning to continue executing the step S32 a; when the timing time t3 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S33; when the engine oil pressure P reaches the calibrated lubrication threshold a but the counted time T1 does not reach the set time threshold B, the third timer T3 is cleared and step S34 is executed.

Technical Field

The invention belongs to the technical field of engines, and particularly relates to a lubrication control method for an engine oil pre-supply pump.

Background

In the actual operation of the engine, particularly a matched generator set, the starting time is very important, and the engine is required to enter a working state as soon as possible. To minimize start-up time, the pre-lubrication phase is skipped directly. However, especially for a large-cylinder-diameter engine, an oil pump pre-supply pump must be used for pre-lubrication before the engine is started (normal start or emergency start), otherwise, the friction bearing part of the engine is abraded due to insufficient lubrication, so that the phenomena of cylinder pulling, tile melting and the like are caused, and the reliability and the service life of the engine are reduced; in the current control strategy, when the engine is in a standby state, once the engine is started in an emergency, a pre-lubrication stage is directly skipped in order to ensure the starting time; the service life of the engine is seriously influenced.

Disclosure of Invention

Aiming at overcoming the defects in the prior art, the invention solves the technical problem of providing a lubricating control method of an engine oil pre-feeding pump; the lubricating device can periodically lubricate the engine in a standby state, can ensure that a layer of engine oil mucosa is arranged between the friction pairs even if the engine enters an emergency starting mode, can prevent the phenomena of cylinder pulling, tile melting and the like while ensuring the starting time, and prolongs the service life of the engine.

In order to solve the technical problem, an embodiment of the invention provides a lubricating control method for an engine oil pre-feeding pump, which comprises an automatic periodic lubricating step which can be selectively executed when an ECU is electrified and an engine is not started; the automatic periodic lubrication step comprises:

s11, the ECU judges whether the current engine oil pressure P reaches a calibrated lubrication threshold value A, if not, the step S12 is executed, and if yes, the step S13 is directly executed;

s12, pre-supplying the pump to work, and timing by a first timer T1; when the ECU determines that the timing time T1 does not reach the set time threshold B and the engine oil pressure P does not reach the calibrated lubrication threshold A, the pre-supply pump continues to work, and the first timer T1 continues to time; when the ECU determines that the timing time T1 reaches a set time threshold B but the engine oil pressure P does not reach a calibrated lubrication threshold A, predicting the fault of a supply pump, stopping lubrication and resetting a first timer T1; when the ECU determines that the engine oil pressure P reaches the calibrated lubrication threshold value A but the timing time T1 does not reach the set time threshold value B, the first timer T1 is cleared and the step S13 is executed;

and S13, keeping the pre-supply pump out of work or stopping work, timing by the second timer T2, clearing the second timer T2 when the timing time T2 reaches the cycle time threshold value C, and returning to execute the step S12.

Further, when the ECU is powered on and the engine is not started, after a manual automatic lubrication switching switch electrically connected with the ECU is manually selected and pressed, the ECU switches the current lubrication mode into an automatic periodic lubrication mode and starts to execute the automatic periodic lubrication step.

Further, step S12 specifically includes:

s121, the pre-supply pump works, and a first timer T1 times;

s122, the ECU judges whether the engine oil pressure P reaches the calibrated lubrication threshold value A again, if so, the first timer T1 is cleared and the step S13 is executed; if not, go to step S123;

s123, the ECU judges whether the timing time t1 reaches a set time threshold B, if so, the step S124 is executed; if not, returning to execute the step S122;

s124, predicting the fault of the pump, stopping lubrication and clearing a first timer T1.

Further, step S12 specifically includes:

s12a, operating the pre-supply pump, and timing by a first timer T1;

S12B, the ECU judges whether the engine oil pressure P reaches a calibrated lubrication threshold value A or not, and simultaneously judges whether the timing time t1 reaches a set time threshold value B or not; when the timing time t1 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, returning to continue executing the step S12 a; when the timing time t1 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S12 c; when the engine oil pressure P reaches the calibrated lubrication threshold A but the timing time t1 does not reach the set time threshold B, executing a step S12 d;

s12c, predicting the fault of a supply pump, stopping lubrication and clearing a first timer T1;

s12d, the first timer T1 is cleared and step S13 is executed.

Further, a set time threshold B is calibrated and stored in the ECU in advance; the calibration method comprises the following steps:

firstly, calibrating the time t required for increasing the engine oil pressure P from zero to a calibrated lubrication threshold value A when the pre-feeding pump works normally through a bench test; then, a set time threshold B greater than time t is calibrated.

Further, the lubricating control method of the engine oil pre-supply pump also comprises a manual lubricating step which can be selected to be executed when the ECU is electrified and the engine is not started; the manual lubrication step includes:

s21, pressing the manual lubricating switch, and observing the engine oil pressure value displayed by the instrument beside the engine in real time;

s22, manually judging whether the engine oil pressure P reaches a calibrated lubrication threshold value A, if so, loosening a manual lubrication switch, and stopping the operation of the pre-supply pump; if not, go to step S23;

and S23, keeping the pressing state of the manual lubrication switch, enabling the pre-supply pump to continue working, reporting an error when the ECU determines that the continuous working time reaches a set time threshold B but the engine oil pressure P does not reach a calibrated lubrication threshold A, and simultaneously cutting off a power supply loop of the pre-supply pump to force the pre-supply pump to stop working.

Further, the lubricating control method of the engine oil pre-supply pump further comprises the following steps:

when the ECU is powered on and an engine emergency starting mode is activated, the pre-supply pump stops working or is ensured not to work, and meanwhile, the starter acts, and the engine is started emergently.

Further, activating the engine emergency start mode by continuously pressing an engine start switch for a set duration; alternatively, the engine emergency start mode is activated by pressing an engine emergency start switch.

Further, the lubricating control method of the engine oil pre-supply pump further comprises the normal lubricating step when the ECU is powered on and the normal starting mode of the engine is activated:

the normal lubrication step includes:

s31, the ECU judges whether the current engine oil pressure P reaches a calibrated lubrication threshold value A, if not, the step S32 is executed, and if yes, the step S34 is directly executed;

s32, the pre-supply pump works, and a third timer T3 times; when the timing time T3 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, the pre-supply pump continues to work, and the third timer T3 continues to time; when the timing time t3 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S33; when the engine oil pressure P reaches the calibrated lubrication threshold A but the timing time T1 does not reach the set time threshold B, clearing the third timer T3 and executing the step S34;

s33, predicting the fault of a supply pump, stopping lubrication, clearing a third timer T3, prohibiting the action of a starter and not starting an engine;

and S34, keeping the pre-supply pump out of work or stopping work, and simultaneously, actuating the starter to normally start the engine.

Further, step S32 specifically includes:

s321, the pre-supply pump works, and a third timer T3 times;

s322, judging whether the engine oil pressure P reaches the calibrated lubrication threshold value A again by the ECU, if so, clearing the third timer T13 and executing the step S34; if not, executing step S323;

s323, the ECU judges whether the timing time t3 reaches a set time threshold B, if so, the step S33 is executed; if not, returning to execute the step S322;

alternatively, step S32 specifically includes:

s32a, the pre-supply pump works, and a third timer T3 times;

S32B, the ECU judges whether the engine oil pressure P reaches a calibrated lubrication threshold value A or not, and simultaneously judges whether the timing time t3 reaches a set time threshold value B or not;

when the timing time t3 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, returning to continue executing the step S32 a; when the timing time t3 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S33; when the engine oil pressure P reaches the calibrated lubrication threshold a but the counted time T1 does not reach the set time threshold B, the third timer T3 is cleared and step S34 is executed.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the invention relates to a lubricating control method of an engine oil pre-supply pump, which comprises an automatic periodic lubricating step which can be selected to be executed when an ECU is electrified and an engine is not started; the automatic periodic lubrication step comprises: s11, the ECU judges whether the current engine oil pressure P reaches a calibrated lubrication threshold value A, if not, the step S12 is executed, and if yes, the step S13 is directly executed; s12, pre-supplying the pump to work, and timing by a first timer T1; when the ECU determines that the timing time T1 does not reach the set time threshold B and the engine oil pressure P does not reach the calibrated lubrication threshold A, the pre-supply pump continues to work, and the first timer T1 continues to time; when the ECU determines that the timing time T1 reaches a set time threshold B but the engine oil pressure P does not reach a calibrated lubrication threshold A, predicting the fault of a supply pump, stopping lubrication and resetting a first timer T1; when the ECU determines that the engine oil pressure P reaches the calibrated lubrication threshold value A but the timing time T1 does not reach the set time threshold value B, the first timer T1 is cleared and the step S13 is executed; and S13, keeping the pre-supply pump out of work or stopping work, timing by the second timer T2, clearing the second timer T2 when the timing time T2 reaches the cycle time threshold value C, and returning to execute the step S12. The steps can automatically and periodically lubricate the engine when the engine is in a standby state, and can correspondingly shorten the starting time because the periodic lubrication is carried out in the standby state when the engine enters a normal starting mode; even if the engine enters an emergency starting mode, a layer of engine oil mucosa can be ensured to be arranged between the friction pairs, and the service life of the engine can be prolonged while the starting time is ensured.

In conclusion, no matter the engine is started normally or in emergency under the standby state, the invention can effectively ensure that a layer of engine oil mucosa is arranged between the friction pairs, avoid the abrasion of the friction bearing part of the engine caused by the lack of lubrication, prevent the phenomena of cylinder pulling, tile melting and the like of the engine, and improve the reliability and the service life of the engine.

Drawings

FIG. 1 is a schematic diagram of a pre-feed pump lubrication control system;

FIG. 2 is a flowchart of the lubrication steps of the present invention when the ECU is powered up and the engine is not started;

FIG. 3 is a flow chart of another embodiment of the automatic periodic lubrication step of FIG. 2:

FIG. 4 is a flowchart of the steps of the lubrication of the present invention during engine start on ECU;

FIG. 5 is a flow chart of another embodiment of the normal lubrication step of FIG. 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 2, the embodiment discloses a lubrication control method for an engine oil pre-feeding pump, which is implemented based on a pre-feeding pump lubrication control system, wherein the pre-feeding pump lubrication control system includes an ECU, an ECU power-on switch electrically connected with the ECU, an engine starting switch, a manual automatic lubrication change-over switch, a manual lubrication switch, a fault diagnosis lamp, a pre-feeding pump relay, and an engine oil pressure sensor. The lubricating control method of the engine oil pre-supply pump specifically comprises an automatic periodic lubricating step which can be selectively executed when the ECU is electrified and the engine is not started (namely an ECU electrifying switch is closed and an engine starting switch is not operated); the automatic periodic lubrication step comprises:

s11, the ECU judges whether the current oil pressure P reaches the calibrated lubrication threshold value A, if not, the step S12 is executed, and if yes, the step S13 is directly executed. The ECU is electrically connected with the engine oil pressure sensor, and acquires the engine oil pressure P transmitted by the engine oil pressure sensor in real time.

S12, a pre-pump works (a pre-pump relay is electrified), and a first timer T1 (which is integrated in the ECU and can also be used for timing by using a crystal oscillator, namely a quartz oscillator) is used for timing; when the ECU determines that the timing time T1 does not reach the set time threshold B and the engine oil pressure P does not reach the calibrated lubrication threshold A, the pre-supply pump continues to work, and the first timer T1 continues to time; when the ECU determines that the timing time T1 reaches a set time threshold B but the engine oil pressure P does not reach a calibrated lubrication threshold A, predicting the fault of a feed pump (a fault diagnosis lamp flickers at a certain frequency), stopping lubrication (the feed pump stops working), and resetting a first timer T1; when the ECU determines that the oil pressure P reaches the calibrated lubrication threshold A but the counted time T1 does not reach the set time threshold B, the first timer T1 is cleared and step S13 is executed.

And S13, keeping the pre-supply pump out of work or stopping work (the pre-supply pump relay is powered off, and the power supply loop of the pre-supply pump is cut off), timing by a second timer T (which is integrated in the ECU, and can also be selected to be timed by using a crystal oscillator, namely a quartz oscillator) 2, clearing the second timer T2 when the timing time T2 reaches the cycle time threshold value C, and returning to execute the step S12.

When the ECU is powered on and the engine is not started, after a manual automatic lubrication change-over switch electrically connected with the ECU is manually selected and pressed, the ECU changes the current lubrication mode into an automatic periodic lubrication mode, and starts to execute the automatic periodic lubrication step. In brief, the ECU is given a trigger signal to select the execution of the automatic periodic lubrication step by operating the manual automatic lubrication changeover switch.

In still other embodiments where a manual automatic lubrication switch is not provided, the ECU may be given a trigger signal to trigger entry into the automatic periodic lubrication mode by not pressing the manual lubrication switch for a set period of time.

In this embodiment, step S12 shown in fig. 2 specifically includes:

s121, the pre-supply pump works, and the first timer T1 times.

S122, the ECU judges whether the engine oil pressure P reaches the calibrated lubrication threshold value A again, if so, the first timer T1 is cleared and the step S13 is executed; if not, go to step S123.

S123, the ECU judges whether the timing time t1 reaches a set time threshold B, if so, the step S124 is executed; if not, the process returns to step S122.

S124, predicting the fault of the pump, stopping lubrication and clearing a first timer T1.

In still other embodiments, as shown in fig. 3, step S12 specifically includes:

s12a, the pre-supply pump works, and the first timer T1 times.

S12B, the ECU judges whether the engine oil pressure P reaches a calibrated lubrication threshold value A or not, and simultaneously judges whether the timing time t1 reaches a set time threshold value B or not; when the timing time t1 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, returning to continue executing the step S12 a; when the timing time t1 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S12 c; when the engine oil pressure P reaches the calibrated lubrication threshold A but the timing time t1 does not reach the set time threshold B, executing a step S12 d;

s12c, predicting the fault of the pump, stopping lubrication and clearing a first timer T1.

S12d, the first timer T1 is cleared and step S13 is executed.

It should be noted that, the first engine oil pressure P and the timing time t1 may be sequentially determined in order; the first engine oil pressure P and the timer time t1 may be determined simultaneously. The determination process is not limited as long as it is ensured that the ECUs can obtain the same determination result.

In the embodiment, a set time threshold B is calibrated and stored in the ECU in advance; the calibration method comprises the following steps:

firstly, calibrating the time t required for increasing the engine oil pressure P from zero to a calibrated lubrication threshold value A when a pre-supply pump works normally through a bench test; then, a set time threshold B much larger than the time t is calibrated. The situation that the preset time threshold B is too small to cause the pre-feeding pump to normally work and the engine oil pressure P does not reach the calibrated lubrication threshold A within the preset time threshold B is avoided, and misjudgment is prone to occurring.

In order to increase the universality of the control method of the engine oil pre-supply pump, the engine oil pre-supply pump is suitable for the lubrication of the engine under different working conditions; the method also comprises a manual lubrication step which can be selectively executed when the ECU is powered on and the engine is not started (the ECU is given a trigger signal for selecting the manual lubrication step by pressing a manual lubrication button); the manual lubricating step comprises:

and S21, pressing the manual lubricating switch (self-resetting), and observing the engine oil pressure value displayed by the instrument beside the engine in real time.

S22, manually judging whether the engine oil pressure P reaches a calibrated lubrication threshold value A, if so, loosening the manual lubrication switch to stop the operation of the pre-supply pump, and if not, executing a step S23.

And S23, keeping the pressing state of the manual lubrication switch, enabling the pre-feeding pump to continue to work, reporting an error when the ECU judges that the continuous working time reaches a set time threshold B but the engine oil pressure P does not reach a calibrated lubrication threshold A, and simultaneously cutting off a power supply loop of the pre-feeding pump to force the pre-feeding pump to stop working.

As shown in fig. 4 and 5, in order to further increase the versatility of the oil pre-supply pump control method, the engine is lubricated under different working conditions; the lubricating control method for the engine oil pre-supply pump in the embodiment further comprises the following steps: when the ECU is powered on and an engine emergency starting mode is activated, the pre-supply pump stops working or is guaranteed not to work, and meanwhile, the starter acts, and the engine is started emergently. Wherein the engine emergency start mode may be activated by continuously pressing the engine start switch for a set duration (5 seconds); in still other embodiments, the engine emergency start mode is activated by pressing an engine emergency start switch.

The method for controlling lubrication of the oil pre-supply pump further comprises a normal lubrication step when the ECU is powered on and the engine is activated in a normal starting mode. Wherein the normal engine start mode can be activated by clicking and pressing an engine start switch (pressing and then releasing immediately); in still other embodiments, the normal engine start mode is activated by pressing an engine normal start switch.

The normal lubrication step comprises:

s31, the ECU judges whether the current oil pressure P reaches the calibrated lubrication threshold value A, if not, the step S32 is executed, and if yes, the step S34 is directly executed.

S32, pre-supplying a pump to work, and timing by a third timer T3 (which is integrated in the ECU and can be timed by a crystal oscillator, namely a quartz oscillator); when the timing time T3 does not reach the set time threshold B and the engine oil pressure P does not reach the calibrated lubrication threshold A, the pre-supply pump continues to work, and the third timer T3 continues to time; when the timing time t3 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S33; when the engine oil pressure P reaches the calibrated lubrication threshold a but the counted time T1 does not reach the set time threshold B, the third timer T3 is cleared and step S34 is executed.

S33, predicting the fault of the supply pump, stopping lubrication, clearing the third timer T3, prohibiting the action of the starter and not starting the engine.

And S34, keeping the pre-supply pump out of work or stopping work, and simultaneously, actuating the starter to normally start the engine.

As shown in fig. 4, step S32 specifically includes:

s321, the pre-supply pump works, and the third timer T3 times.

S322, judging whether the engine oil pressure P reaches the calibrated lubrication threshold value A again by the ECU, if so, clearing the third timer T13 and executing the step S34; if not, go to step S323.

S323, the ECU judges whether the timing time t3 reaches a set time threshold B, if so, the step S33 is executed; if not, the process returns to step S322.

In some embodiments, as shown in fig. 5, step S32 specifically includes:

s32a, the pre-supply pump works, and the third timer T3 times.

S32B, the ECU judges whether the engine oil pressure P reaches a calibrated lubrication threshold value A or not, and simultaneously judges whether the timing time t3 reaches a set time threshold value B or not;

when the timing time t3 does not reach the set time threshold B and the oil pressure P does not reach the calibrated lubrication threshold A, returning to continue executing the step S32 a; when the timing time t3 reaches the set time threshold B but the oil pressure P does not reach the calibrated lubrication threshold A, executing a step S33; when the engine oil pressure P reaches the calibrated lubrication threshold a but the timing time t1 does not reach the set time threshold B, step S34 is executed.

In summary, the method for controlling lubrication of an engine oil pre-feeding pump integrates an automatic periodic lubrication step that can be selectively executed when the ECU is powered on and the engine is not started, a manual lubrication step that can be selectively executed when the ECU is powered on and the engine is not started, a normal lubrication step when the ECU is powered on and the engine is activated in a normal starting mode, and a step when the ECU is powered on and the engine is activated in an emergency starting mode. Engine lubrication under different operating conditions may be used. No matter the engine is started normally or in emergency under the standby state, a layer of engine oil mucosa can be effectively ensured to be arranged between the friction pairs, abrasion caused by the fact that the friction bearing part of the engine is not lubricated in place is avoided, the phenomena of cylinder pulling, tile changing and the like of the engine are prevented, and the reliability and the service life of the engine are improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.