Engine safety shutdown system and oil injection turn-off method and device of engine

Abstract

The invention provides an engine safety shutdown system and an oil injection turn-off method and device of an engine. The oil injection turn-off method of the engine comprises the steps that the state of a key switch T15 is monitored; when the T15 is located at the falling edge, a timer is triggered to start timing; and when the timing indication of the timer reaches the delay of the preset time, an oil injection turn-off path is activated. In the oil injection turn-off method of the engine, the trigger condition of oil injection turn-off only uses the state of T15 instead of any condition related to the original logic, so that the situation that flameout cannot be performed due to common cause failure or cascade failure between conditions with logic relationship caused by the same condition is avoided, and therefore the engine can be safely stopped.

Description

technical field [0001] The present application relates to the technical field of engines, in particular to an engine safety shutdown system and its method and device for shutting off fuel injection. Background technique [0002] When the electronically controlled diesel engine vehicle is running, the driver can transmit the driving demand through the accelerator pedal opening, and the ECU (Electronic Control Unit, electronic control unit) calculates the real-time The amount of fuel injection and the position of fuel injection, so that the engine enters the required operating conditions, such as idling, acceleration, deceleration, parking, etc. When the vehicle stops and the driver powers off T15 (Terminal15, key switch), the vehicle enters the flameout state, and after a short period of After RUN operation, the main relay is turned off, which is a normal parking process. [0003] However, at present, in order to achieve high-precision control of fuel injection and meet spec...

AI Technical Summary

Problems solved by technology

[0003] However, at present, in order to achieve high-precision control of fuel injection and meet specific emission standards, in addition to the condition of pedal opening, many conditions are introduced for torque calculation and correction. As vehicles become more and more intelligent, the torque path becomes more and more more and more complicated

If the acquisition of the pedal opening is inaccurate during the parking process (the actual opening is 0, and the software collects a non-zero value), or some abnormal conditions such as memory crash occur in the memory area of ​​some logical operation, it may lead to the consequence that the engine cannot be turned off. This kind of software-level failure can seriously threaten the personal safety of drivers or pedestrians in certain driving environments

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