Method and apparatus to control logic valves for hydraulic flow control in an electro-mechanical transmission
First Claim
1. A method for controlling an electro-mechanical transmission comprising first and second electric machines and a hydraulic circuit having a plurality of flow management valves and pressure control solenoids operative to actuate a plurality of clutches and a plurality of pressure monitoring devices adapted to monitor said hydraulic circuit, said transmission operative in fixed gear and continuously variable operating range states through selective actuation of said clutches, the method comprising:
- operating said hydraulic circuit as a multi-layered control system, wherein a first layer comprises said flow management valves selectively permitting a hydraulic flow to a hydraulic cooling circuit for said electric machines and to said clutches and a second layer comprises said pressure control solenoids varying pressure of said hydraulic flow;
monitoring a current hydraulic circuit oil temperature;
monitoring a current state of said flow management valves;
monitoring a command for cooling of said electric machines;
monitoring a selected transition from a current transmission operating range state to a desired transmission operating range state;
utilizing a state machine defining possible transitions for said flow management valves to determine a sequence for controlling positions of said flow management valves to achieve said desired transmission operating range state based upon said current hydraulic circuit oil temperature, said current state of said flow management valves, said command for cooling of said electric machines, and said desired transmission operating range state, wherein the utilizing said state machine to determine said sequence comprises, determining a desired state of said flow management valves based upon said desired transmission operating range state; and
applying valve logic-based rules to determine said sequence for controlling positions of said flow management valves based upon said desired state of said flow management valves; and
controlling said flow management valves based upon said sequence.
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Accused Products
Abstract
A method for controlling an electromechanical transmission includes monitoring a current hydraulic circuit oil temperature, monitoring a current state of flow management valves, monitoring a command for cooling of electric machines, monitoring a desired transmission operating range state, utilizing a state machine to determine a sequence for controlling positions of the flow management valves to achieve the desired transmission operating range state based upon the monitored properties.
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Citations
9 Claims
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1. A method for controlling an electro-mechanical transmission comprising first and second electric machines and a hydraulic circuit having a plurality of flow management valves and pressure control solenoids operative to actuate a plurality of clutches and a plurality of pressure monitoring devices adapted to monitor said hydraulic circuit, said transmission operative in fixed gear and continuously variable operating range states through selective actuation of said clutches, the method comprising:
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operating said hydraulic circuit as a multi-layered control system, wherein a first layer comprises said flow management valves selectively permitting a hydraulic flow to a hydraulic cooling circuit for said electric machines and to said clutches and a second layer comprises said pressure control solenoids varying pressure of said hydraulic flow; monitoring a current hydraulic circuit oil temperature; monitoring a current state of said flow management valves; monitoring a command for cooling of said electric machines; monitoring a selected transition from a current transmission operating range state to a desired transmission operating range state; utilizing a state machine defining possible transitions for said flow management valves to determine a sequence for controlling positions of said flow management valves to achieve said desired transmission operating range state based upon said current hydraulic circuit oil temperature, said current state of said flow management valves, said command for cooling of said electric machines, and said desired transmission operating range state, wherein the utilizing said state machine to determine said sequence comprises, determining a desired state of said flow management valves based upon said desired transmission operating range state; and
applying valve logic-based rules to determine said sequence for controlling positions of said flow management valves based upon said desired state of said flow management valves; andcontrolling said flow management valves based upon said sequence. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for controlling an electro-mechanical transmission comprising first and second electric machines and a plurality of hydraulically-actuated clutches, said transmission operative in fixed gear and continuously variable operating range states through selective actuation of said clutches, said apparatus comprising:
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a hydraulic control system selectively directing a hydraulic flow to functions including actuation of said clutches and an electric machine cooling circuit, said hydraulic control system comprising a first control layer comprising flow management valves and a second control layer; and a hydraulic control system control module, including logic operations configured for monitoring requirements of said functions, monitoring a desired transmission operating range state, determining a desired valve configuration of said flow management valves based upon said requirements and said desired transmission operating range state, monitoring a current valve configuration of said flow management valves, and executing preferred valve transitions to reach said desired valve configuration based upon a state machine algorithm modeling potential valve transition paths between said current valve configuration and said desired valve configuration. - View Dependent Claims (8, 9)
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Specification