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US 8,958,933 B2Granted
Engine control system
AssigneeFord Global Technologies, LLC
InventorOsama A Abihana
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for adjusting the operation of an electric coolant pump in a hybrid vehicle system. During vehicle compression braking conditions, a motor propels the vehicle while the engine spins un-fueled to absorb torque. During such conditions, the coolant pump is operated based on the absorbed torque to maintain an engine temperature within a threshold.
Claims17
A method for operating a hybrid vehicle system, comprising:
- during conditions when a hybrid vehicle is propelled by a motor and while an engine spins un-fueled, absorbing torque at the engine and not at a system battery to maintain vehicle speed at a desired speed while adjusting operation of an engine coolant pump based on the absorbed torque to control engine temperature, a state of charge of the battery being greater than an upper limit.
A method for operating a hybrid a vehicle, comprising:
- during a first condition, propelling the vehicle via each of a motor and an engine while operating an electric coolant pump based on coolant temperature to cool the engine;
- during a second condition, propelling the vehicle via the motor with the engine stopped while operating the coolant pump based on coolant temperature to cool the engine;
- and
- during a third condition, propelling the vehicle via the motor with the engine spinning un-fueled while operating the coolant pump based on an amount of torque absorbed by the engine to cool the engine.
1 more element
A hybrid vehicle system, comprising:
- an engine;
- a motor;
- an electric coolant pump configured to circulate coolant through an engine cylinder head;
- and
- a control system with computer readable instructions for:
- when the engine is spinning fueled, operating the coolant pump continuously to maintain a cylinder head temperature;
- and
- when the engine is spinning un-fueled, absorbing torque at the engine to maintain a desired vehicle speed and operating the coolant pump intermittently to maintain the cylinder head temperature, wherein operating the coolant pump intermittently includes operating the pump with a speed and frequency based on the absorbed torque, the absorbed torque increased as a vehicle speed increases relative to the desired vehicle speed.
5 more elements
Dependencies are inferred from the claim text.