Patent ID: 8424373
Filing Date: 2013-04-23
Classification: F16H,G01M

Abstract:
1. A variator fault detection circuit, comprising a first shift valve movable from a first position to a second position axially spaced from the first position in a first valve chamber of a hydraulic control circuit for a continuously variable transmission, the first shift valve having a first port in fluid communication with a variator of the continuously variable transmission and a second port axially spaced from the first port, a second shift valve movable from a first position to a second position axially spaced from the first position in a second valve chamber of the hydraulic control circuit of the continuously variable transmission, the second shift valve having a first port in fluid communication with the variator of the continuously variable transmission and a second port axially spaced from the first port, a first pressure switch coupled to the second port of the first shift valve, a second pressure switch coupled to the second port of the second shift valve, a first electro-hydraulic actuator coupled to the first shift valve, and a second electro-hydraulic actuator coupled to the second shift valve.