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Hydraulic Vehicle Clutch System and Method

  • US 20090032360A1
  • Filed: 08/02/2007
  • Published: 02/05/2009
  • Est. Priority Date: 08/02/2007
  • Status: Abandoned Application
First Claim
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1. An apparatus for transferring a torque from a vehicle drive train to multiple wheels of a vehicle, comprising:

  • at least two clutches each having a driven part and a driving part;

    a hydraulic system configured to actuate each of the clutches by placing the driven part into engagement with the driving part, the hydraulic system including,at least two pistons configured to move each of the driven parts into engagement with a respective driving part when an operating hydraulic fluid pressure is supplied to the pistons,at least two pumps configured to supply an output hydraulic fluid pressure,at least two purge valves each located between and connected in parallel with one of the pumps and a respective one of the pistons,a first hydraulic line connecting directly between a first of the pistons and a first of the purge valves such that there is no substantial change of hydraulic pressure along the first hydraulic line, anda second hydraulic line connecting directly between a second of the pistons and a second of the purge valves such that there is no substantial change of hydraulic pressure along the second hydraulic line; and

    a controller configured to control the pumps and the purge valves to provide a desired hydraulic pressure to respective ones of the pistons.

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