Patent ID: 9688257
Date: 2017-06-27
CPC Classifications: B60T

Claim:
1. A hydraulic control system for a transmission having a park mechanism, the hydraulic control system comprising: a source of pressurized hydraulic fluid; a park servo connected to the park mechanism, the park servo having a park side, an out-of-park side, and a biasing member disposed on the park side; a first valve assembly having a first inlet port in fluid communication with the source of pressurized hydraulic fluid, having a first outlet port, and having a first valve for selectively allowing fluid communication between the first inlet port and the first outlet port; a second valve assembly having a second inlet port in direct fluid communication downstream of the first valve assembly, having a second outlet port in direct fluid communication with the out-of-park side of the park servo, and having a second valve moveable between an out-of-park position and a park position, wherein the second valve allows fluid communication from the second inlet port to the second outlet port when in the out-of-park position and prohibits fluid communication from the second inlet port to the second outlet port when in the park position.