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Engine speed control method and control system of internal-combustion engine

A technology of engine speed and engine, applied in engine control, machine/engine, fuel injection control, etc., can solve problems such as high cost, damage to engine or motor vehicle system, loss, etc.

Inactive Publication Date: 2007-03-14
ORBITAL ENGINE CO PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As will be discussed further below, some speed-dependent engagement devices can cause the problem that if the engine speed exceeds a threshold speed at a point in time when the vehicle motion is not ideal, the driver or cyclist may be in an accident, and had to act quickly to avoid accidents
However, in some cases, such quick disengagement itself may result in damage to the engine or vehicle systems, which may be comparable to the damage caused by the runaway process itself
Thus, while having means to quickly terminate an out-of-control process may be a useful safety feature, certain mechanical systems themselves can be costly and malfunctioning, potentially losing the benefits of including a safety system

Method used

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  • Engine speed control method and control system of internal-combustion engine
  • Engine speed control method and control system of internal-combustion engine

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Embodiment Construction

[0033] The control method of the present invention occurs once the ECU is powered and also during the operation of the engine. In this embodiment, the engine is coupled to the vehicle driveline by means of a CVT having a predetermined engagement threshold speed at which engine output torque is transmitted to the vehicle wheels. Typically, the motor vehicle may be a small displacement scooter or moped, but other motor vehicle devices are also considered to fall within the scope of the present invention.

[0034] The engine also includes a dual-fluid fuel injection system that delivers fuel entrained in the air directly into the engine's combustion chambers. Correspondingly, the combustion process needs to schedule the fuel measurement process, the fuel delivery process and the ignition process. Typically, when the air injector is controlled to deliver a measured amount of fuel into the engine through the air, the fuel delivery event is also considered an air event. Typically,...

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Abstract

A method of controlling the speed of an engine whilst the engine is operating in a crank or idle state, including the steps of (a) determining when the engine is operating in said crank or idle state; (b) determining whether the engine speed is above an upper threshold speed, and (c) controlling the engine when the engine speed is above the upper threshold speed so as to effect a reduction in the engine speed to avoid an engine speed runaway event.

Description

technical field [0001] The invention relates to a method of protecting an internal combustion engine of a motor vehicle from an engine speed runaway condition. In particular, the invention relates to motor vehicles comprising speed-dependent coupling devices such as continuously variable drive trains and viscous couplings. Background technique [0002] In recent years, the application of continuously variable drive trains to motor vehicles has become more popular, especially scooters, mopeds, high traffic vehicles (AVTs) and certain other small motor vehicles. These motor vehicles that include continuously variable powertrain (CVT) usually work relatively simply in such a situation: the driver or rider only needs to control the actuation of the throttle or the accelerator, and do not care about themselves, while as Manual shifting between gears is done as is required in some other arrangements. Broadly speaking, a typical CVT arrangement has a threshold engagement speed or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/16F02D41/22F02D41/06F02D31/00
CPCF02D31/008F02D31/001
Inventor 斯图尔特·格拉海姆·普赖斯戴维·理查德·沃思
Owner ORBITAL ENGINE CO PTY LTD