|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||180/133 ; 60/405 ; 340/52R ; 340/516|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 7 인용 특허 : 3|
An emergency or backup steering system includes a backup pump which is driven by an electric motor. A control circuit for the motor automatically energizes it upon the main supply of hydraulic power steering fluid becoming inadequate for normal steering operation. The control circuit provides for checkout of the portions thereof governing actuation of the backup system and provides for indicating failure in the backup system of both the electrical and hydraulic portions thereof.
In a vehicle hydraulic power steering system including main and backup pumps, an electrically responsive drive for the backup pump and electric control circuitry for automatically effecting energization of the drive upon a failure of the main pump to output fluid adequate for normal steering operation and a test circuit between an “on”contact of a vehicle ignition and start switch means and the control circuitry to energize the electrically responsive drive when the switch means is placed in an “on”position before starting the vehicle, and said test circ...