Electrical pump apparatus

Abstract

An electrical pump apparatus is provided in which a situation where a failure detection circuit becomes inoperative before detection of a failure of an electric system can be avoided, and the certainty of failure detection can be enhanced. An attaching portion which is to be attached to a vehicle body is formed so that, in a state where an electrical pump apparatus is attached to the vehicle body, a circuit board of a control device is perpendicular to the horizontal direction. A control IC chip which constitutes a microcomputer for detecting a failure of the electric system is placed on a circuit board so as to be higher in the direction of gravity from a lowest water level Hmin at which flooding in a housing causes the electric system to be short-circuited.

1 . An electrical pump apparatus comprising: a pump which is configured to generate an oil pressure; a motor which is configured to drive the pump; a control device which is configured to control an operation of the motor; and a housing which houses the pump, the motor, and the control device, and which has an attaching portion to be attached to a vehicle body, wherein
 a failure detection circuit which is configured to detect a failure of an electric system that electrically connects the motor with an electric power supply is disposed on a circuit board of the control device, and   the failure detection circuit is placed on the circuit board to be higher in a direction of gravity than a lowest water level at which flooding in the housing causes the electric system to break down.   
     
     
         2 . The electrical pump apparatus according to  claim 1 , wherein the attaching portion is formed so that, in a state where the attaching portion is attached to the vehicle body, the circuit board is perpendicular to a horizontal direction. 
     
     
         3 . The electrical pump apparatus according to  claim 1 , wherein the failure detection circuit is placed to be higher than a range of ⅓ from a lower end of the circuit board in the direction of gravity. 
     
     
         4 . The electrical pump apparatus according to  claim 1 , wherein the attaching portion is formed so that, in a state where the attaching portion is attached to the vehicle body, the circuit board is in a horizontal direction, and the failure detection circuit is mounted on an upper surface of the circuit board, whereby the failure detection circuit is placed so as to be higher in the direction of gravity than the lowest water level. 
     
     
         5 . The electrical pump apparatus according to  claim 1 , further comprising: a current detecting unit which is configured to detect a current supplied to the motor, wherein the failure detection circuit detects the failure of the electric system based on the current detected by the current detecting unit. 
     
     
         6 . The electrical pump apparatus according to  claim 1 , further comprising: a voltage detecting unit which is configured to detect a voltage applied to the motor, wherein the failure detection circuit detects the failure of the electric system based on the voltage detected by the voltage detecting unit. 
     
     
         7 . The electrical pump apparatus according to  claim 2 , wherein the failure detection circuit is placed to be higher than a range of ⅓ from a lower end of the circuit board in the direction of gravity.