Hybrid electric vehicle auxiliary oil pump
First Claim
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1. A transmission for a hybrid electric vehicle comprising:
- an input shaft with a main transmission fluid pump drivingly connected thereto;
an electronically controlled hydraulic shift system;
a low-reverse clutch and a forward clutch connected to the hydraulic shift system;
an electronically driven fluid pump having a fluid output; and
a pressure transducer operatively engaging the fluid output;
a controller in communication with the pressure transducer, and a solid state relay electronically connected to and drivable by the controller, and with the electronically driven pump electronically connected to and drivable by the solid state relay;
a shut down shuttle valve operatively engaging the electrically driven fluid pump, the low/reverse clutch and the forward clutch and switchable to selectively engage and disengage the electronically driven pump from the hydraulic shift system.
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Abstract
An automatic transmission for a hybrid electric vehicle where an engine is shut down during vehicle stops to improve fuel economy. The automatic transmission includes a main pump that is driven off of a transmission input shaft, and an electronically driven auxiliary pump. A shut down shuttle valve switches a hydraulic circuit connection from the main pump to the auxiliary pump for a low-reverse clutch and a forward clutch when the vehicle stops in drive or low gear. A pressure transducer, controller and steady state relay allow for closed loop feedback to control the auxiliary pump in order to assure sufficient hydraulic pressure while minimizing power consumption.
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Citations
9 Claims
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1. A transmission for a hybrid electric vehicle comprising:
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an input shaft with a main transmission fluid pump drivingly connected thereto;
an electronically controlled hydraulic shift system;
a low-reverse clutch and a forward clutch connected to the hydraulic shift system;
an electronically driven fluid pump having a fluid output; and
a pressure transducer operatively engaging the fluid output;
a controller in communication with the pressure transducer, and a solid state relay electronically connected to and drivable by the controller, and with the electronically driven pump electronically connected to and drivable by the solid state relay;
a shut down shuttle valve operatively engaging the electrically driven fluid pump, the low/reverse clutch and the forward clutch and switchable to selectively engage and disengage the electronically driven pump from the hydraulic shift system. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hybrid powertrain for a vehicle comprising:
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an internal combustion engine;
a traction motor drivingly connected to the engine; and
a transmission having an input shaft, with a main transmission fluid pump drivingly connected thereto, an electronically controlled hydraulic shift system, a low-reverse clutch and a forward clutch connected to the hydraulic shift system, an electronically driven fluid pump having a fluid output, a pressure transducer operatively engaging the fluid output, a controller in communication with the pressure transducer, a solid state relay electronically connected to and drivable by the controller, with the electronically driven pump electronically connected to and drivable by the solid state relay, and with a shut down shuttle valve operatively engaging the electrically driven fluid pump, the low/reverse clutch and the forward clutch and switchable to selectively engage and disengage the electronically driven pump from the hydraulic shift system. - View Dependent Claims (8, 9)
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Specification