Device and method for preventing over-rotation of engines

Abstract

A device and method that suppresses delay in response to gear-shifting in upshifting during control for preventing over-rotation. An engine torque control part controls the torque of the engine based on a driver request (APO) for driving force, a rotation velocity sensor detects the rotation velocity of the engine, and an over-rotation preventing part suppresses the controlled torque based on thevelocity and prevents over-rotation of the engine. An over-rotation prevention releasing part releases suppression of the torque based on the rotation velocity lowered due to upshifting of the automatic transmission, and an engine torque increasing rate regulating part regulates the increasing rate of the torque when said suppression of the torque is released and the torque is increased. Thus, a sudden increase in engine torque is avoided.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Patent Application No. 2003-038426 (filing date: July 26, 2005), the entire contents of which are incorporated herein by reference. technical field [0003] The invention relates to an over-rotation preventing device for preventing over-rotation of an engine. Background technique [0004] If the engine rotates beyond the allowable upper limit rotation speed, problems such as deterioration of the durability of the engine will occur. As a technique for preventing this problem, for example, the technique described in Japanese Patent Application Laid-Open No. 2004-245191 has been proposed. [0005] In the case of preventing engine overrun by switching control of fuel supply, it will have a bad influence on the catalyst of the engine exhaust system or cause deterioration of drivability. Therefore, this technology replaces the above method. The amount of throttle valve opening ...

AI Technical Summary

Problems solved by technology

[0004] If the engine rotates beyond the allowable upper limit rotation speed, problems such as deterioration of the durability of the engine will occur, so as a technology to prevent this problem, for example, the technology described in Japanese Patent Application Laid-Open No. 2004-245191 has been proposed.

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