JPH0195408U

JPH0195408U -

Info

Publication number: JPH0195408U
Application number: JP19161987U
Authority: JP
Priority date: 1987-12-17
Filing date: 1987-12-17
Publication date: 1989-06-23
Anticipated expiration: 2002-12-17
Also published as: JPH0710889Y2

Description

[Brief explanation of the drawing]

第１図は本考案第１実施例の車高調整装置を示
す全体図、第２図は実施例装置の制御回路の作動
の流れを示すフローチヤート、第３図は実施例装
置の各部の作動を示すタイミングチヤートである
。１…ポンプ、２…エンジン、４ｂ…（メインの
）アキユムレータ、５…液圧供給回路、６…圧力
制御弁、７…第１チエツクバルブ、８…ドレーン
回路、９…出力回路、１０…制御回路、１１…車
高調整アクチユエータ、１３…第２チエツクバル
ブ、１４…圧力センサ、１５…イグニツシヨンス
イツチ（エンジンセンサ）、１６…車高センサ、
１７…車速センサ（走行センサ）。 Fig. 1 is an overall diagram showing the vehicle height adjustment device according to the first embodiment of the present invention, Fig. 2 is a flowchart showing the operation flow of the control circuit of the embodiment device, and Fig. 3 is the operation of each part of the embodiment device. This is a timing chart showing the following. 1... Pump, 2... Engine, 4b... (main) accumulator, 5... Hydraulic pressure supply circuit, 6... Pressure control valve, 7... First check valve, 8... Drain circuit, 9... Output circuit, 10... Control circuit , 11...Vehicle height adjustment actuator, 13...Second check valve, 14...Pressure sensor, 15...Ignition switch (engine sensor), 16...Vehicle height sensor,
17...Vehicle speed sensor (driving sensor).

Claims

[Scope of Claim for Utility Model Registration] An accumulator that temporarily stores hydraulic pressure supplied from an engine-driven pump;
a check valve; a pressure control valve connected to the accumulator via a hydraulic pressure supply circuit and also connected to the drain circuit side to control output hydraulic pressure; and driven by the output hydraulic pressure of the pressure control valve; A vehicle height adjustment actuator capable of controlling the vehicle height and attitude; a second check valve provided in the drain circuit and using the hydraulic pressure on the pump side as a pilot pressure; and a pressure sensor that detects the hydraulic pressure of the vehicle height adjustment actuator. , a vehicle height sensor that detects the vehicle height, an engine sensor that detects when the engine is started, and a travel sensor that detects when the vehicle is running; The output hydraulic pressure of the pressure control valve is controlled to match the detected hydraulic pressure for a certain period of time, and after this certain period of time, when the vehicle is stopped, the vehicle height gradually returns to the standard vehicle height as time passes. In addition to controlling the output hydraulic pressure of the pressure control valve so as to match the standard, when the vehicle is running, the average value of the vehicle height detected by the vehicle height sensor is calculated, and this average vehicle height becomes the standard value over time. Executes key-on control that controls output hydraulic pressure as a function of time to gradually match vehicle height;
A vehicle height adjustment device comprising: a control circuit that performs normal control after the key-on control ends;