Tractor hydraulic brake circuit with ABS capability
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60T-008/40
B60T-008/17
B60T-008/48
B60T-011/21
출원번호
US-0658152
(2012-10-23)
등록번호
US-8974011
(2015-03-10)
발명자
/ 주소
Schick, Troy E.
Volfson, Boris
출원인 / 주소
Deere & Company
인용정보
피인용 횟수 :
4인용 특허 :
12
초록▼
A vehicle brake system includes a pump, a sump, brake units and left and right manually operated brake valves. The brake system also includes, for each brake unit, a solenoid operated on-off valve having a first port connected to a pilot of one of the brake valves, a second port, a third port connec
A vehicle brake system includes a pump, a sump, brake units and left and right manually operated brake valves. The brake system also includes, for each brake unit, a solenoid operated on-off valve having a first port connected to a pilot of one of the brake valves, a second port, a third port connected to one of the brake units, a solenoid and a spring which opposes the solenoid. The brake system also includes, for each brake unit, a solenoid operated proportional valve. Each proportional valve controls communication between the pump, the sump and the second port of a corresponding one of the on-off valves.
대표청구항▼
1. A vehicle brake system comprising: a hydraulic pump;a sump;a left brake pedal;a right brake pedal operable independently of the left brake pedal;a left brake unit;a right brake unit;a left manually operated brake valve operable only by the left brake pedal and having a first pressure responsive p
1. A vehicle brake system comprising: a hydraulic pump;a sump;a left brake pedal;a right brake pedal operable independently of the left brake pedal;a left brake unit;a right brake unit;a left manually operated brake valve operable only by the left brake pedal and having a first pressure responsive pilot acting in opposition to a left manual actuator;a right manually operated brake valve operable only by the right brake pedal and having a second pressure responsive pilot acting in opposition to a right manual actuator;a solenoid operated left on-off non-proportional valve having a first port connected to the first pilot, a second port, a third port connected to left brake unit, a solenoid and a spring which opposes the solenoid;a solenoid operated right on-off non-proportional valve having a first port connected to the second pilot, a second port, a third port connected to right brake unit, a solenoid and a spring which opposes the solenoid;a pair of solenoid operated proportional valves, each proportional valve controlling communication between the pump, the sump and the second port of a corresponding one of the on-off valves. 2. The brake system of claim 1, further comprising: a pair of brake pressure sensors, each brake pressure sensor being connected to a corresponding one of the brakes and generating a corresponding brake pressure signal. 3. The brake system of claim 1, further comprising: a pair of pilot pressure sensors, each pilot pressure sensor being connected to a corresponding one of the pressure responsive pilots and generating a corresponding pilot pressure signal. 4. The brake system of claim 1, wherein: each proportional valve includes a pressure feedback line which acts in opposition to the solenoid and which is connected the second port of the corresponding on-off valve. 5. The brake system of claim 1, wherein: a filter is connected the pump and each of the proportional valves. 6. The brake system of claim 1, wherein: each proportional valve includes a first port connected to the sump, a second port connected to the pump and a third port connected to the second port, of the corresponding on-off valve. 7. A vehicle brake system comprising: a hydraulic pump;a sump;a left brake pedal;a right brake pedal operable independently of the left brake pedal;a left rear brake unit;a right rear brake unit;a left front brake unit;a right front brake unit;a left manually operated brake valve operable only by the left brake pedal and having a first pressure responsive pilot acting in opposition to a left manual actuator;a right manually operated brake valve operable only by the right brake pedal and having a second pressure responsive pilot acting in opposition to a right manual actuator;a solenoid operated left rear on-off non-proportional valve having a first port connected to the first pilot, a second port, a third port connected to left rear brake unit, a solenoid and a spring which opposes the solenoid;a solenoid operated right rear on-off non-proportional valve having a first port connected to the second pilot, a second port, a third port connected to right rear brake unit, a solenoid and a spring which opposes the solenoid;a solenoid operated left front on-off non-proportional valve having a first port connected to the sump, a second port, a third port connected to left front brake unit, a solenoid and a spring which opposes the solenoid;a solenoid operated right front on-off non-proportional valve having a first port connected to the sump, a second port, a third port connected to right front brake unit, a solenoid and a spring which opposes the solenoid; anda plurality of solenoid operated proportional valves, each proportional valve controlling communication between the pump, the sump and the second port of a corresponding one of the on-off valves. 8. The brake system of claim 7, further comprising: a plurality of brake pressure sensors, each brake pressure sensor being connected to a corresponding one of the brakes and generating a corresponding brake pressure signal. 9. The brake system of claim 7, further comprising: a pair of pilot pressure sensors, each pilot pressure sensor being connected to a corresponding one of the pressure responsive pilots and generating a corresponding pilot pressure signal. 10. The brake system of claim 7, wherein: each proportional valve includes a pressure feedback line which acts in opposition to the solenoid and which is connected the second port of the corresponding on-off valve. 11. The brake system of claim 7, wherein: a filter is connected the pump and each of the proportional valves. 12. The brake system of claim 8, wherein: each proportional valve includes a first port connected to the sump, a second port connected to the pump and a third port connected to the second port of the corresponding on-off valve.
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