METHOD AND APPARATUS TO CONTROL OPERATION OF A HYDRAULIC CONTROL CIRCUIT FOR AN ELECTRO-MECHANICAL TRANSMISSION
First Claim
1. Method to control an electro-mechanical transmission comprising first and second electrical machines and a hydraulic circuit comprising a plurality of pressure control devices and flow management valves, the method comprising:
- monitoring an operating temperature of the electrical machines;
determining a cooling flow rate in the hydraulic circuit effective to reduce the operating temperature of the electrical machines;
determining availability of active cooling for each of the electrical machines; and
selectively controlling hydraulic flow in the hydraulic circuit.
13 Assignments
0 Petitions
Accused Products
Abstract
A method and an apparatus for controlling an electro-mechanical transmission selectively operative in a plurality of fixed gear modes and continuously variable modes is provided. The exemplary transmission comprises first and second electrical machines and a hydraulic circuit comprising a plurality of pressure control devices and flow management valves. The method comprises monitoring an operating temperature of the electrical machines. A cooling flow rate in the hydraulic circuit effective to reduce the operating temperature of the electrical machines is determined. Availability of active cooling for each of the electrical machines is determined. Hydraulic flow in the hydraulic circuit is selectively controlled.
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Citations
14 Claims
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1. Method to control an electro-mechanical transmission comprising first and second electrical machines and a hydraulic circuit comprising a plurality of pressure control devices and flow management valves, the method comprising:
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monitoring an operating temperature of the electrical machines; determining a cooling flow rate in the hydraulic circuit effective to reduce the operating temperature of the electrical machines; determining availability of active cooling for each of the electrical machines; and selectively controlling hydraulic flow in the hydraulic circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Article of manufacture, comprising a storage medium having a computer program encoded therein for effecting a method to control an electro-mechanical transmission comprising first and second electrical machines and a hydraulic circuit comprising a plurality of pressure control devices and flow management valves, the computer program comprising:
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code to monitor an operating temperature of the electrical machines; code to determine a cooling flow rate in the hydraulic circuit effective to reduce the operating temperature of the electrical machines; code to determine availability of active cooling for each of the electrical machines; and
,code to selectively control hydraulic flow in the hydraulic circuit. - View Dependent Claims (10, 11)
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12. Device to transmit torque to a driveline, comprising:
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first and second electrical machines and a plurality of planetary gear sets coaxially oriented about a shaft; a plurality of torque-transfer devices selectively actuatable by a hydraulic circuit, the hydraulic circuit comprising a plurality of pressure control devices and first and second flow management valves and a plurality of pressure monitoring devices; and
,a control system, adapted to; i) monitor an operating temperature of the electrical machines; ii) determine a cooling flow rate in the hydraulic circuit effective to reduce the operating temperature of the electrical machines; iii) determine availability of active cooling for each of the electrical machines; and
,iv) selectively control hydraulic flow in the hydraulic circuit. - View Dependent Claims (13, 14)
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Specification