System and control method of engine position management

Abstract

The invention discloses a system of engine position management. According to the system of the engine position management, an enhancement mode time processing unit (ETPU) is adopted to achieve rapid and synchronic fault-tolerance. According to a crank signal processing module, a jumping edge of a crank position signal detected by an input crank position sensor is collected for several times. According to a cram shaft signal processing module, electrical level and a jumping edge of a cram shaft position signal detected by an input cram shaft position sensor are collected for several times in a mixing mode. According to a synchronous logical processing module, a crank state quantity signal output by the crank signal processing module and a cram shaft state quantity signal output by the cram shaft signal processing module are processed and analyzed and a synchronous state quantity signal is output so that an engine state can be changed in real time and synchronism of a crank and a cram shaft is finally achieved. The invention further discloses a control method for the engine position management. The system and the method are capable of achieving the process of the synchronism of an engine rapidly and steadily.

Description

technical field [0001] The invention relates to a control system of engine position detection synchronization logic, in particular to a fast synchronization fault-tolerant engine position management system using an eTPU (enhanced time processing unit) unit. The invention also relates to a control method for engine position management with an eTPU unit. Background technique [0002] In order to improve the economy, stability and emission of contemporary diesel engines, it is imperative to adopt advanced control units. The key point of engine control is to find the mechanical position of the engine to determine the top dead center position of the piston for accurate fuel injection. At present, the industry mainly collects the crankshaft position signal and the camshaft position signal at the same time, and combines the two signals to calculate and judge as the main means of engine position measurement. [0003] The underlying drive of the engine is mainly divided into two pa...

AI Technical Summary

Problems solved by technology

The length of the process from engine start to normal operation often affects the sensory enjoyment of the user. If the ignition time of the starter key is too short, the ECU has not had time to complete the detection of the synchronization position, and the engine cannot work normally, which will cause complaints from customers.

The traditional synchronous detection method is to set and capture the jump edge of the camshaft position signal in the camshaft position signal acquisition channel, but in the actual engine operating conditions, the ECU will cause the camshaft position signal to jump due to signal clutter and noise. Misjudgment of variable edge

Although the method of detection and verification can be used to verify the synchronization in the next engine cycle, it takes extra time and makes the user feel that the vehicle starts slowly, which cannot bring a good user experience

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