Anti-runaway control method and device for a hybrid system engine

Abstract

The invention provides an overspeed-prevention controlling method and device for an engine with a hybrid power system. The method comprises the following steps: acquiring an entire-car driving power required value; checking a target rotation speed mapping table to acquire an engine target rotation speed value matched with the entire-car driving power required value based on the target rotation speed mapping table; carrying out calculation by adopting a motor torque calculation formula according to the entire-car driving power required value and the target rotation speed to acquire an engine required torque original value; acquiring a feedforward torque limit value of the engine; extracting a minimum value of the engine required torque original value and the feedforward torque limit value as a first comparison value; carrying out calculation based on the target rotation speed and practical rotation speed of the engine to acquire an engine closed loop rotation speed torque limit value; and extracting a minimum value of the first comparison value and the engine closed loop rotation speed torque limit value as engine required torque, so that overspeed accidents of the engine can be prevented.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a control method and device for engine anti-running of a hybrid power system. Background technique [0002] flying car: see figure 1 , refers to the situation that the engine speed suddenly exceeds the required speed when the engine is running, and it cannot recover by itself. The engine cannot respond according to the control mode preset by the system, and the engine power cannot be fully output effectively. This is a system failure mode. The occurrence of flying car failure is not only a waste of fuel, but also the excessively high speed can easily cause vicious accidents such as broken engine connecting rods or connecting rod bolts and cylinder scuffing, so measures must be taken to stop the "speeding car" as soon as possible; [0003] Planetary hybrid system: It is a system composed of engine, motor and generator. In the planetary hybrid system, the engine, motor ...

AI Technical Summary

Problems solved by technology

If there is a problem with the coordinated control, such as engine torque overshoot, generator torque response abnormality, etc., the torque of the engine cannot be effectively output to the vehicle, resulting in a sharp increase in speed, that is, speeding, resulting in insufficient power of the vehicle and increased fuel consumption.

Images