engine start control

Abstract

A start-up controller of an engine includes an intention detector (31, 33), a first setter (4a) and a limit controller (5). The intention detector (31, 33) detects an intensity of a start intention of a driver. The first setter (4a) determines a limit rotation rate (N ELIM_H ) based on the start intention detected by the intention detector (31, 33), as a limit of the rotation rate of the engine, wherein the limit rotation rate (Ne LIM_H ) decreases as the start intention weakens. The limit controller (5) performs limit control for controlling the actual rotation rate (Ne) of the engine so as not to exceed the limit rotation rate (Ne LIM_H ) determined by the first setter (4a). Such a configuration prevents revving-up of the engine at start-up while improving the start-up performance.

Description

technical field [0001] The present invention relates to a start control device for controlling the rotation speed of an engine when starting. Background technique [0002] Conventionally, there is known an idle stop system that automatically stops and restarts an engine according to the running state of a vehicle. A typical idle stop system executes control to automatically stop the engine (idle stop control, automatic stop control) and cut off fuel supply when the engine is idling while waiting for a signal, for example. In addition, when a driver's (driver's) intention to start is detected by an accelerator operation or the like, control for automatically restarting the engine (automatic restart control) is performed. In recent years, these controls have been applied to various on-vehicle engines regardless of the type of vehicle and the combustion method of the engine. [0003] However, in a general engine, the engine rotation speed (engine rotation speed) at the time o...

AI Technical Summary

Problems solved by technology

[0009] Like this, there is such problem in the control of existing engine, promptly it is difficult to properly restrain the engine rotation speed that may occur at the beginning of starting, and it is difficult to improve the starting performance of the engine.

Especially when the automatic restart control is used to restart the idle stop state, it is difficult to properly set and control the engine output because not only the torque oscillation must be suppressed, but also the engine can be restarted quickly.

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