Device and method for preventing over-rotation of engines

A technology of engine and engine torque, which is applied in the direction of engine control, combustion engine, machine/engine, etc., can solve the problem of engine durability decline and achieve the effect of reducing sudden idling

Active Publication Date: 2007-01-31
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Device and method for preventing over-rotation of engines
  • Device and method for preventing over-rotation of engines
  • Device and method for preventing over-rotation of engines

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Embodiment Construction

[0022] Hereinafter, embodiments of the present invention will be described in detail based on the embodiments shown in the drawings.

[0023] figure 1 Shown is a power train of a vehicle having an engine over-rotation prevention device as an embodiment of the present invention and a control system thereof, and the power train is constituted by an engine 1 and an automatic transmission 2 .

[0024] Engine 1 is a gasoline engine. The throttle valve 3 as the output determining unit of the engine 1 is not mechanically connected to the accelerator pedal 4 operated by the driver, but is separated from the accelerator pedal. The opening is electronically controlled.

[0025] The engine controller 6 has an engine torque control unit, an over-rotation prevention unit, an over-rotation prevention release unit, an engine torque increase speed limiting unit, and an upper limit speed setting unit (not shown). The throttle valve actuator 5 controls the amount of operation by operating in...

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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 ...

Claims

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Application Information

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IPC IPC(8): F02D41/04F02D41/14F02D41/22
CPCY02T10/40
Inventor 远田让村上贤一郎
Owner NISSAN MOTOR CO LTD
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