Assisted start control method for in-cylinder direct injection engine starter

Abstract

The invention relates to an assisted start control method for an in-cylinder direct injection engine starter. The method is characterized by comprising the specific steps that a starter assisted startmodule in an ECU receives a quick assisted start command; an engine start parameter is calculated according to a precise stop phase position stored in the ECU; under the circumstance that the engineis stationary, the ECU controls an oil atomizer of an expansion cylinder to inject fuel into the expansion cylinder according to the fuel injection time duration of the expansion cylinder; and the ECUcan achieve effective matching of acting of the expansion cylinder with a starting torque of the starter through an engaged feedback signal of the starter, so that the starting load of the starter isreduced to the maximum extent and the starting currents of the starter and a storage battery are reduced. As the starting process is directly started from the expansion cylinder, a process of recognizing engine synchronization by the ECU is cancelled, so that the starting time is shortened.

Description

technical field [0001] The invention relates to a starter auxiliary starting control method of an in-cylinder direct injection engine, in particular to a starter auxiliary start control method of an in-cylinder direct injection engine with a start-stop control system, and belongs to the technical field of engine control. Background technique [0002] The engine start-stop control system refers to a system that automatically stops the engine when the vehicle is temporarily parked, and automatically starts when it needs to continue driving. When waiting for signal lights or traffic jams, the start-stop control system can shorten the idling time of the engine, reduce fuel consumption, reduce emissions, and improve fuel economy. According to statistics, the start-stop control system can save fuel by up to 15% in urban traffic conditions. [0003] In order to realize the function of restarting the engine after shutdown, there are currently the following technical routes: [000...

AI Technical Summary

Problems solved by technology

This method does not take into account the meshing state of the small teeth of the starter, resulting in a mismatch between the power of the expansion cylinder and the power of the starter: if the expansion cylinder does work first and the small teeth are not fully meshed, there will be a phenomenon of tooth beating, which will generate loud noises. Cause the engine to fail to start; if the expansion cylinder completes the work after the starter is running, it will not be able to form a resultant force when the starting load of the starter is the largest, and the starting load cannot be effectively reduced

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