Multiplexed control system and method for an electrically variable hybrid transmission
First Claim
1. A control system for an electrically variable hybrid transmission comprising:
- a multiplex valve;
a solenoid valve operable to selectively provide fluid pressure to said multiplex valve;
an electronic transmission range selection valve in selective fluid communication with said multiplex valve; and
a dog clutch relay valve in selective fluid communication with said multiplex valve.
14 Assignments
0 Petitions
Accused Products
Abstract
A powertrain has an electrically variable hybrid transmission having an electro-hydraulic control system, plurality of electrical power units, and a plurality of torque transmitting mechanisms selectively engageable by the electro-hydraulic control system to provide four forward speed ranges, a neutral condition, an electric low and high speed mode, and an electrically variable low and high speed mode. Additionally, the electrically variable hybrid transmission provides a parallel reverse mode and a series reverse mode. The present invention provides an improved electro-hydraulic control system having a multiplexed electronic transmission range selection (ETRS) and reverse dog clutch system for an electrically variable hybrid transmission. The multiplexed control system of the present invention allows effective control of both the ETRS system and reverse dog clutch system using only one solenoid valve.
72 Citations
17 Claims
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1. A control system for an electrically variable hybrid transmission comprising:
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a multiplex valve;
a solenoid valve operable to selectively provide fluid pressure to said multiplex valve;
an electronic transmission range selection valve in selective fluid communication with said multiplex valve; and
a dog clutch relay valve in selective fluid communication with said multiplex valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of controlling an electronic transmission range selection valve and a dog clutch relay valve comprising:
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providing a solenoid valve operable to provide a control pressure to the electronic transmission range selection valve and the dog clutch relay valve;
providing a multiplex valve in selective fluid communication with the electronic transmission range selection valve and the dog clutch relay valve and operable to selectively direct said control pressure to the electronic transmission range selection valve and the dog clutch relay valve;
controlling said multiplex valve to direct said control pressure to the electronic transmission range selection valve when said multiplex valve is in a first position; and
controlling said multiplex valve to direct said control pressure to the dog clutch relay valve when said multiplex valve is in a second position. - View Dependent Claims (11, 12)
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13. A control system for an electrically variable hybrid transmission comprising:
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a boost valve;
a solenoid valve operable to selectively provide fluid pressure to said boost valve;
an electronic transmission range selection valve in selective fluid communication with said boost valve;
a dog clutch relay valve in selective fluid communication with said boost valve; and
wherein said boost valve has a spring set position and a pressure set position, said boost valve being operable to distribute pressurized fluid from said solenoid valve to said electronic transmission range selection valve when in said spring set position, and said boost valve being operable to distribute pressurized fluid from said solenoid valve to said dog clutch relay valve when in said pressure set position. - View Dependent Claims (14, 15, 16, 17)
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Specification