CONTROL APPARATUS, METHOD AND DIAGNOSTIC FOR HYDRAULIC FILL AND DRAIN
First Claim
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1. Hydraulic control for a chamber fill and drain comprising:
- a source of pressurized fluid;
a fluid trim valve having first, second and third ports, said first port fluidly coupled to a first fluid line, said second port fluidly coupled to a chamber, said third port fluidly coupled to a fluid exhaust line, said valve having first and second positions, said first position effective to fluidly couple said first port to said second port, said second position effective to fluidly couple said second port to said third port; and
, a fluid blocking valve having respective first, second and third ports, said first port fluidly coupled to said pressurized fluid source, said second port fluidly coupled to said first fluid line, said third port fluidly coupled to said fluid exhaust line, said valve having first and second positions, said first position effective to fluidly couple said first port to said second port, said second position effective to fluidly couple said second port to said third port;
wherein said chamber is supplied with pressurized fluid when the fluid trim and fluid blocking valves are both in respective first positions, said chamber is selectively exhausted of pressurized fluid through the fluid coupling of the second and third ports of the first valve when said fluid trim valve is in the respective second position and the fluid blocking valve is in the respective first position, and said chamber is selectively exhausted of pressurized fluid through the fluid coupling of the second and first ports of the fluid trim valve, the first fluid line, and the second and third ports of the fluid blocking valve when said fluid trim valve is in the respective first position and the fluid blocking valve is in the respective second position.
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Abstract
Hydraulic fill and drain of a clutch chamber is controlled with a blocking valve and a trim valve. The blocking valve selectively provides pressurized fluid to the trim valve which in turn selectively provides the pressurized fluid to the clutch chamber. Exhausting of the clutch chamber is effected through one of two alternate paths utilizing deactivation of one of the trim and blocking valves. Back up exhausting of the clutch chamber is effected through the other of the alternative paths. Such system allows for determination of valve failures and continued operation until such failures can be rectified.
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Citations
13 Claims
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1. Hydraulic control for a chamber fill and drain comprising:
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a source of pressurized fluid;
a fluid trim valve having first, second and third ports, said first port fluidly coupled to a first fluid line, said second port fluidly coupled to a chamber, said third port fluidly coupled to a fluid exhaust line, said valve having first and second positions, said first position effective to fluidly couple said first port to said second port, said second position effective to fluidly couple said second port to said third port; and
,a fluid blocking valve having respective first, second and third ports, said first port fluidly coupled to said pressurized fluid source, said second port fluidly coupled to said first fluid line, said third port fluidly coupled to said fluid exhaust line, said valve having first and second positions, said first position effective to fluidly couple said first port to said second port, said second position effective to fluidly couple said second port to said third port;
wherein said chamber is supplied with pressurized fluid when the fluid trim and fluid blocking valves are both in respective first positions, said chamber is selectively exhausted of pressurized fluid through the fluid coupling of the second and third ports of the first valve when said fluid trim valve is in the respective second position and the fluid blocking valve is in the respective first position, and said chamber is selectively exhausted of pressurized fluid through the fluid coupling of the second and first ports of the fluid trim valve, the first fluid line, and the second and third ports of the fluid blocking valve when said fluid trim valve is in the respective first position and the fluid blocking valve is in the respective second position. - View Dependent Claims (2, 3, 5)
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4. (canceled)
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6. Method for controlling a fill and drain cycle of a fluid chamber comprising:
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filling said chamber by a) providing pressurized fluid to a fluid blocking valve, b) routing the pressurized fluid through the fluid blocking valve to a fluid trim valve, and c) routing said pressurized fluid through said fluid trim valve to the fluid chamber; and
,draining said chamber by exhausting said fluid chamber by invoking one of a) a first routing for pressurized fluid from the fluid chamber through the fluid trim valve directly to an exhaust destination, and b) a second routing for pressurized fluid from the fluid chamber through the fluid trim valve to the fluid blocking valve, and then through the fluid blocking valve to the exhaust destination. - View Dependent Claims (7, 8, 9)
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10. Method for diagnosing valve faults in a hydraulic system, said hydraulic system including a controllable first valve and a controllable second valve, said first valve effective in a first position to fluidly couple a pressurized fluid source to a fluid passage and in a second position to fluidly decouple the pressurized fluid source from the fluid passage, said second valve effective in a first position to fluidly couple the fluid passage to a chamber and in a second position to fluidly decouple the fluid passage from the chamber, wherein said chamber is fluidly coupled to said pressurized fluid source when the first valve and second valve are simultaneously in respective first positions, comprising:
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providing an exhaust path for the fluid in the fluid passage through the first valve when the first valve is in the second position;
providing an exhaust path for the fluid in the chamber through the second valve when the second valve is in the second position;
subsequent to the first valve and second valve being in respective first positions, performing one of a) commanding the first valve to its second position and diagnosing a fault with the first valve if the fluid in the chamber fails to exhaust properly, and b) commanding the second valve to its second position and diagnosing a fault with the second valve if the fluid in the chamber fails to exhaust properly. - View Dependent Claims (11, 12, 13)
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Specification