IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0176273
(2008-07-18)
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등록번호 |
US-8490758
(2013-07-23)
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발명자
/ 주소 |
- Ollat, Xavier
- Guo, Yingpei
- Lotter, Robert
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출원인 / 주소 |
- Meggitt (North Hollywood), Inc.
|
대리인 / 주소 |
Knobbe Martens Olson & Bear, LLP
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인용정보 |
피인용 횟수 :
2 인용 특허 :
22 |
초록
▼
An electro-hydraulic brake system for a vehicle can include at least one hydraulic piston that exerts a force on a brake pad in a direction away from a brake disk and opposite to a force exerted, e.g., by a spring, on the brake pad in a direction toward the disk. A hydraulic pressure actuator can in
An electro-hydraulic brake system for a vehicle can include at least one hydraulic piston that exerts a force on a brake pad in a direction away from a brake disk and opposite to a force exerted, e.g., by a spring, on the brake pad in a direction toward the disk. A hydraulic pressure actuator can in one embodiment actuate the hydraulic piston to hold the brake in a disengaged position. A controller can in one embodiment actuate the hydraulic pressure actuator to advance the brake pad into engagement with the disk to exert a braking force based on a brake command signal, and can in one embodiment actuate the hydraulic pressure actuator to retract the brake pad from engagement with the disk upon receipt of a brake release signal. In one embodiment, the brake pad can move into engagement with the brake disk when an emergency (e.g., a loss of power or hydraulic pressure) occurs.
대표청구항
▼
1. An electro-hydraulic brake system for a vehicle, comprising: a caliper positionable about a portion of a brake disk of a driving wheel of the vehicle, the caliper comprising one or more hydraulic cylinders and one or more springs, each of the cylinders arranged generally in parallel with at least
1. An electro-hydraulic brake system for a vehicle, comprising: a caliper positionable about a portion of a brake disk of a driving wheel of the vehicle, the caliper comprising one or more hydraulic cylinders and one or more springs, each of the cylinders arranged generally in parallel with at least one of the one or more springs;one or more hydraulic pistons configured to travel within the one or more hydraulic cylinders and to exert a force on a brake pad attached to the caliper in a direction away from the brake disc and opposite to a spring force exerted on the brake pad in a direction toward the disc by the one or more springs, the brake pad moveable into contact with the brake disc to exert a braking force on the driving wheel of the vehicle;a hydraulic pressure actuator in communication with the one or more hydraulic pistons and configured to actuate the one or more hydraulic pistons, the hydraulic pressure actuator comprising a master cylinder in communication with the one or more hydraulic pistons and a self-locking lead screw configured to transmit an actuation force onto the master cylinder; anda controller configured to receive a brake command signal from a user pressing on a brake pedal of the vehicle and to convert the brake command signal into a braking force demand, the controller configured to generate a brake actuator command based at least in part on the braking force demand and to communicate the brake actuator command to the hydraulic pressure actuator to thereby operate the hydraulic pressure actuator to adjust the position of the brake pad to a position relative to the brake disk corresponding to the brake actuator command and to maintain the brake pad at said position until another brake command signal is received from the user pressing on the brake pedal. 2. The brake actuator system of claim 1, wherein the hydraulic pressure actuator comprises a bypass valve, the controller configured to open the bypass valve upon a loss of electric power, thereby reducing a hydraulic pressure acting on the one or more hydraulic piston so that the spring force moves the brake pad into engagement with the disc. 3. The brake actuator system of claim 1, wherein the hydraulic pressure actuator requires zero power to maintain the position of the brake pad relative to the disc based on the brake actuator command received from the controller. 4. The brake actuator system of claim 1, wherein the controller requires about 2A or less to actuate the hydraulic pressure actuator to disengage the brake pad from the disc. 5. The brake actuator system of claim 1, wherein the controller is configured to disengage the brake pad from the disc in about 200 ms or less. 6. The brake actuator system of claim 1, wherein the controller is configured to engage the brake pad with the disc in about 100 ms or less. 7. The brake actuator system of claim 1, wherein the controller is configured to actuate the hydraulic pressure actuator to disengage the brake pad from the disc upon receipt of a brake release signal, the controller configured to actuate the hydraulic pressure actuator so as to move the brake pad away from the disc until the controller determines that the brake pad has disengaged the disc. 8. The brake actuator system of claim 7, wherein the controller determines that the brake pad disengages the disc at least in part by receiving a zero braking force signal from a sensor proximate the brake pad. 9. The brake actuator of claim 7, wherein the controller determines that the brake pad disengages the disc at least in part by comparing an estimated position of the hydraulic pressure actuator relative to a threshold position where the brake pad engages the disc. 10. The brake actuator of claim 7, wherein the controller determines that the brake pad disengages the disc at least in part by comparing the spring force exerted by the one or more springs to a threshold spring force value when the brake pad engages the disc. 11. An electro-hydraulic brake system for a vehicle, comprising: a caliper disposable circumferentially about a portion of a brake disc of a driving wheel of the vehicle such that a portion of the disc radially extends into a slot of the caliper defined between a top portion and a bottom portion of the caliper, the caliper comprising one or more hydraulic cylinders and one or more springs disposed between the top portion of the caliper and a brake pad;one or more hydraulic pistons configured to travel within the one or more hydraulic cylinders and to exert a force on the brake pad attached to the caliper in a direction opposite to a spring force exerted on the brake pad by the one or more springs, the brake pad moveable to exert a braking force on the driving wheel of the vehicle;a master cylinder in communication with the at least one hydraulic piston and configured to actuate the at least one hydraulic piston;a self-locking lead screw configured to transmit an actuation force onto the master cylinder; anda controller configured to receive a brake command signal from a user pressing on a brake pedal of the vehicle and to generate a brake actuator command based at least in part on a sensed brake demand, the controller configured to communicate the brake actuator command to the self-locking lead screw to thereby actuate the master cylinder to move the brake pad via the one or more hydraulic pistons to a position relative to the brake disk that corresponding to the brake actuator command and to maintain the brake pad at said position until another brake command signal is received from the user pressing on the brake pedal. 12. The brake actuator system of claim 11, wherein the master cylinder comprises a bypass valve, the controller configured to open the bypass valve upon a loss of electric power, thereby reducing a hydraulic pressure acting on the one or more hydraulic pistons such that the spring force moves the brake pad into engagement with the wheel to exert a braking force on the wheel. 13. The brake actuator system of claim 11, wherein the self-locking lead screw requires zero power to maintain the brake pad at said position. 14. The system of claim 11, wherein the one or more hydraulic cylinders and the one or more springs are arranged side by side with each other between the top portion of the caliper and the brake pad. 15. The brake actuator system of claim 11, wherein the controller is configured to actuate the self-locking lead screw to disengage the brake pad upon receipt of a brake release signal, the controller configured to actuate the lead screw to move the brake pad until the controller determines that the brake pad is fully disengaged from the wheel. 16. The brake actuator of claim 15, wherein the controller determines that the brake pad is fully disengaged at least in part by comparing an estimated position of the self-locking lead screw relative to a threshold position where the brake pad is engaged.
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