JPH0380341U

JPH0380341U -

Info

Publication number: JPH0380341U
Application number: JP14157489U
Authority: JP
Priority date: 1989-12-08
Filing date: 1989-12-08
Publication date: 1991-08-16

Description

[Brief explanation of the drawing]

第１図は本考案に係る一実施例の液体圧力源の
構成図、第２図はアキユムレータの構造を示す断
面図、第３図はＥＣＵ内の機能別のブロツク図、
第４図はアキユムレータの液体圧力と圧力スイツ
チの出力信号の関係を示す図、第５図は液体圧力
源の初期設定時の液体圧力の変化を示す図、第６
図はアキユムレータにガム漏れが生じた時の液体
圧力の変化および圧力スイツチの出力信号を示す
図、第７図は別実施例のＥＣＵ内の機能別のブロ
ツク図である。１……液体圧機器、２……アキユムレータ、３
……モータ、４……ポンプ、５……圧力スイツチ
、６，７……逆止弁、８……液体タンク、９……
安全弁、１０……ＥＣＵ、２０……ハウジング、
２１……ダイヤフラム、２２……背圧室、２３…
…蓄圧室、２４……ホルダー、２５……ガス栓、
２６……通孔、３０……判断手段、３１……計時
手段、３２……モータ駆動信号出力手段、３３…
…ランプ駆動信号出力手段、３４……ランプ、４
０……ＥＣＵ、４１……判断手段、４２……計時
手段、４３……モータ駆動信号出力手段、４４…
…ランプ駆動信号出力手段、４５……検出手段。 Fig. 1 is a configuration diagram of a liquid pressure source according to an embodiment of the present invention, Fig. 2 is a sectional view showing the structure of an accumulator, Fig. 3 is a block diagram of each function in the ECU,
Fig. 4 is a diagram showing the relationship between the liquid pressure of the accumulator and the output signal of the pressure switch, Fig. 5 is a diagram showing the change in liquid pressure at the time of initial setting of the liquid pressure source, and Fig.
The figure shows the change in liquid pressure and the output signal of the pressure switch when gum leaks from the accumulator, and FIG. 7 is a block diagram of each function in the ECU of another embodiment. 1...Liquid pressure equipment, 2...Accumulator, 3
... Motor, 4 ... Pump, 5 ... Pressure switch, 6, 7 ... Check valve, 8 ... Liquid tank, 9 ...
Safety valve, 10...ECU, 20...housing,
21...Diaphragm, 22...Back pressure chamber, 23...
...Accumulation chamber, 24...Holder, 25...Gas valve,
26... Through hole, 30... Judgment means, 31... Timing means, 32... Motor drive signal output means, 33...
... Lamp drive signal output means, 34 ... Lamp, 4
0... ECU, 41... Judgment means, 42... Timing means, 43... Motor drive signal output means, 44...
...Lamp drive signal output means, 45...Detection means.

Claims

[Scope of Claim for Utility Model Registration] 1. A liquid tank, a pump that pumps liquid from the liquid tank, a back pressure chamber that is filled with gas by a movable partition wall provided in a housing, and a back pressure chamber that stores the liquid pumped by the pump. a second predetermined pressure greater than the first predetermined pressure from when the liquid pressure stored in the accumulator is detected and the liquid pressure becomes equal to or less than the first predetermined pressure; and a pressure switch that generates a signal to drive the pump until the pressure exceeds the second predetermined pressure. A measuring means for measuring the time required to detect the problem or the amount of change in state due to the drive of the pump based on the signal from the pressure switch, and a failure signal if the time or amount of change measured by the measuring means is within a reference value. 1. A failure detection device for a liquid pressure source, comprising: a failure signal output means for outputting a failure signal. 2. When the measuring means measures the required time, the signal state and the second The measuring means is provided with a detection means for detecting a signal state after a predetermined period of time has elapsed from a falling signal for detecting a predetermined pressure of 2. The failure detection device for a liquid pressure source according to claim 1, wherein the device measures the time until a certain event is detected.