System and method for regulating pressure in an automatic transmission
First Claim
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1. A hydraulic system for supplying fluid to a transmission clutch actuator comprising:
- an outlet having a fluid pressure;
a first pump having a supply conduit and a discharge conduit;
a second pump having a supply conduit and a discharge conduit, said discharge conduits of said first and second pumps hydraulically communicating with said outlet, said second pump being operable in a first operating state wherein said second pump increases the fluid pressure in said outlet and a second operating state wherein said second pump decreases the fluid pressure in said outlet;
a pressure regulating system operably coupled to said second pump to control the operating state of said second pump.
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Abstract
An apparatus and a method for controlling the pressure in an automatic transmission with an electric pump. The electric pump supplies and removes hydraulic fluid from the automatic transmission in response to various conditions. The addition of an electric pump to control pressure within the transmission allows the mechanical pump driven by the engine to be reduced in size and improve fuel economy.
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Citations
19 Claims
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1. A hydraulic system for supplying fluid to a transmission clutch actuator comprising:
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an outlet having a fluid pressure;
a first pump having a supply conduit and a discharge conduit;
a second pump having a supply conduit and a discharge conduit, said discharge conduits of said first and second pumps hydraulically communicating with said outlet, said second pump being operable in a first operating state wherein said second pump increases the fluid pressure in said outlet and a second operating state wherein said second pump decreases the fluid pressure in said outlet;
a pressure regulating system operably coupled to said second pump to control the operating state of said second pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A hydraulic system for an automatic transmission of a vehicle having an engine, said hydraulic system comprising:
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an actuating assembly having a fluid pressure;
a first pump having a first fluid supply;
a second pump having a second fluid supply, said first and second fluid supplies combining to form said fluid pressure;
a pressure regulation system including an electric motor communicating a unidirectional torque to said second pump to control said second fluid supply. - View Dependent Claims (10, 11)
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12. A method of controlling a fluid pressure in an actuator assembly of an automatic transmission of a vehicle having an engine, comprising:
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supplying a hydraulic fluid to the actuator assembly with a first pump to create a fluid pressure;
determining a desired pressure; and
controlling said fluid pressure with a second pump. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification