Frictional torque compensation method and device as well as idle speed control method and system

Abstract

The invention discloses a frictional torque compensation method and device as well as an idle speed control method and system and belongs to the field of automobile electronic control. The frictional torque compensation method comprises the following steps: inquiring an initial frictional torque from a prestored torque pulse spectrum table according to the current engine operating parameter; carrying out double integration on the D-value of the current revolving speed and a target revolving speed to obtain a frictional torque compensation value; and adding the initial frictional torque and the frictional torque compensation value together to obtain a final frictional torque. The frictional torque compensation system realizes the frictional torque compensation method, and the idle speed control method and an idle speed control system utilize the final frictional torque acquired by the compensation to carry out idle speed control; the D-value of the current revolving speed and the target revolving speed is subjected to double integration so as to obtain the frictional torque compensation value, thereby effectively reducing or eliminating the difference of the frictional torque obtained through searching the table and the actual frictional torque of an engine; and the final frictional torque after compensation is utilized to realize more stable idle speed control.

Description

technical field [0001] The invention relates to the field of automotive electronic control, in particular to a friction torque compensation method, device, idle speed control method and system. Background technique [0002] The idling condition of the engine refers to the stable operation of the engine at the lowest speed when there is basically no power output to the outside world. When idling, if the speed is stable, the output torque of the engine is just in balance with the resistance torque. In the case where the power of the engine is not used to drive the driven device such as a car at all, the task of idling is only to keep the engine from stalling, rather than acting externally. The fuel consumed at idle speed is completely used to overcome friction and other resistances. [0003] The stability control of idle speed is an important task in the research of engine control, and the idle speed control system is also an important part of the engine control system. In ...

AI Technical Summary

Problems solved by technology

Although the production process and performance requirements of the same batch of engines are the same, due to the individual differences between the engines that may occur in the production process and the different running-in degrees of each engine in subsequent use, resulting in the actual use process. The friction torque of the engine of each vehicle will be more or less different

Then in actual use, the current friction torque of the engine obtained by the electronic control part by querying the pre-stored parameter map may have a large difference from the actual friction torque. If the difference is large, it will cause problems such as unstable idle speed.

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