Claims
- 1. An anti-lock brake system, comprising:
a wheel speed sensor for sensing the speed of a wheel; a computer for receiving information from said wheel speed sensor; and a microvalve adapted for receiving electrical signals from said computer; wherein said microvalve comprises a first, second and a third layer. said first layer defining a first port for receiving fluid from a fluid source; one of said first and second layers defining a second port for receiving and/or delivering fluid from the wheel; said second layer defining a plane and a first displaceable member displaceable to a position between and including an open and a closed position, parallel to said plane, relative to said first port and in response to the signal from said computer; and said second layer further defining a second displaceable member displaceable parallel to said plane, to a position between an open and a closed position, relative to said second port, and in response to said signal from said computer.
- 2. The anti-lock brake system of claim 1, wherein said second layer further defines a first actuator for displacing said first displaceable member in response to said signal, and a second actuator for displacing said second displaceable member in response to said signal.
- 3. The anti-lock brake system of claim 2, wherein each of said first and second actuators is a thermal actuator, expandable upon application of a current therethrough.
- 4. The anti-lock brake system of claim 3, wherein said first displaceable member is normally in an open position and said second displaceable member is normally in a closed position.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional application of U.S. Ser. No. 09/148,026, filed Sep. 3, 1998 which is pending and which application is incorporated by reference in its entirety herein.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09148026 |
Sep 1998 |
US |
Child |
10024963 |
Dec 2001 |
US |