JPH023037U

JPH023037U -

Info

Publication number: JPH023037U
Application number: JP8109388U
Authority: JP
Priority date: 1988-06-21
Filing date: 1988-06-21
Publication date: 1990-01-10
Anticipated expiration: 2003-06-21
Also published as: JPH089392Y2

Description

[Brief explanation of drawings]

第１図は本考案の構成を示すブロツク図、第２
図は本考案の一実施例を示すシステム概略図、第
３図は同上実施例におけるアイドル制御弁への駆
動パルス信号のデユーテイ比を設定する制御を示
すフローチヤート、第４図は従来のアイドル回転
速度制御装置における問題点を説明するためのタ
イムチヤートである。３…スロツトル弁、４…補助空気通路、５…ア
イドル制御弁、８…機関、９…コントロールユニ
ツト、１０…回転速度センサ、１２…水温センサ
、１４…エアコン用リレー、１５…電気負荷スイ
ツチ。 Figure 1 is a block diagram showing the configuration of the present invention;
The figure is a system schematic diagram showing an embodiment of the present invention, Figure 3 is a flowchart showing control for setting the duty ratio of the drive pulse signal to the idle control valve in the above embodiment, and Figure 4 is a conventional idle rotation This is a time chart for explaining problems in the speed control device. 3...Throttle valve, 4...Auxiliary air passage, 5...Idle control valve, 8...Engine, 9...Control unit, 10...Rotational speed sensor, 12...Water temperature sensor, 14...Air conditioner relay, 15...Electric load switch.

Claims

[Scope of utility model registration request]

An idle control valve that is installed in the auxiliary air passage that bypasses the throttle valve installed in the engine's intake system and whose opening degree is adjusted according to the duty ratio of the drive pulse signal, and an engine rotation speed detector that detects the engine rotation speed. means, duty ratio setting means for setting the duty ratio so that the engine rotation speed detected under a predetermined idle operating condition approaches a predetermined target rotation speed; engine temperature detection means for detecting engine temperature; limit value setting means for variably setting the open side control limit value of the duty ratio in accordance with the engine temperature detected by the temperature detection means in anticipation of an increase in a predetermined external load of the engine; and a duty ratio set by the duty ratio setting means. duty ratio limit correction means for comparing the duty ratio with the open-side control limit value of the duty ratio set by the limit value setting means and making correction settings so that the duty ratio does not exceed the limit value; drive pulse signal output means for outputting a drive pulse signal to the idle control valve; judgment operation state detection means for detecting a limit value judgment operation state in which a predetermined external load is not applied to the engine; and the judgment operation state. When the detection means detects that the limit value judgment operation state is in effect and the duty ratio is set by the duty ratio setting means, the target rotation speed is obtained in a state where no external load is applied. An idler for an internal combustion engine, comprising: a limit value correction means that compares a preset basic duty ratio with a current duty ratio and corrects the open side control limit value based on the deviation. Rotation speed control device.