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US 9,434,251 B2Granted
All-wheel drive failsafe action axle torque calculation method
AssigneeHonda Motor Co., Ltd.
InventorSteve Turner
Life of this patent
Estimating the term…
Abstract
A method of controlling an all-wheel drive system of a vehicle includes supplying torque to front and rear wheels of the vehicle, sensing a failure of the all-wheel drive system, and adjusting a crankshaft torque of an engine of the vehicle so that the front wheel torque remains constant regardless of a failure of the all-wheel drive system.
Claims16
A method of controlling an all-wheel drive system of a vehicle, comprising:
- supplying torque from an engine of the vehicle to front and rear wheels of the vehicle;
- sensing a failure of the all-wheel drive system with a sensor;
- adjusting a crankshaft torque of the engine with a controller so that the front wheel torque remains constant regardless of a failure of the all-wheel drive system;
- calculating a value of the torque that is supplied to the front wheels prior to a failure of the all-wheel drive system;
- and
- determining the adjusted crankshaft torque based upon the calculated front wheel torque.
3 more elements
A method of controlling a vehicle with an all-wheel drive system, comprising:
- sensing a gear position of a transmission of the vehicle;
- supplying torque of a crankshaft of an engine to front wheels and rear wheels of the vehicle;
- sensing a rotational speed of the crankshaft;
- detecting whether there is a failure of the all-wheel drive system with a sensor;
- and
- limiting the supplied torque to the front wheels for a predetermined time period after a failure of the all-wheel drive system is detected, wherein the limited torque supplied to the front wheels is based upon the gear position of the transmission and the rotational speed of the crankshaft, wherein the limited torque supplied to the rear wheels during the predetermined time period is equal to zero, and wherein subsequent to the predetermined time period, the crankshaft torque is increased at a predetermined rate until being equal to the crankshaft torque prior to the failure of the all-wheel drive system.
3 more elements
A vehicle, comprising:
- an all-wheel drive system including
- an engine that outputs crankshaft torque through a crankshaft,
- a transmission that is coupled to the engine and supplies front wheel torque to front wheels of the vehicle,
- a propeller shaft rotated by the transmission, and
- a rear differential unit powered by the propeller shaft and supplies rear wheel torque to rear wheels of the vehicle;
- an oil pump motor associated with the rear differential unit;
- a temperature sensor that is configured to sense a temperature within the rear differential unit;
- and
- a controller that controls operation of the all-wheel drive system and is configured to receive signals indicative of a failure of the all-wheel drive system, wherein the controller is configured to adjust the crankshaft torque upon receiving a failure signal so that the front wheel torque remains constant during a predetermined time period in which the failure of the all-wheel drive system occurs, wherein the controller is configured to receive signals from the oil pump motor and the temperature sensor, and wherein the controller is configured to determine if a failure of the all-wheel drive system has occurred based upon the signals from the oil pump motor and the temperature sensor.
6 more elements
Dependencies are inferred from the claim text.