Vehicle slip control
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMitsuhiro Nada
Life of this patent
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Abstract
Torque restrictions on a drive shaft are enhanced when the angular acceleration AX of the drive shaft exceed a specific first threshold value. The enhanced torque restrictions are subsequently relaxed when the angular acceleration drops below the first threshold value and further a specific restriction relaxation condition is satisfied. The torque restrictions are expressed as a graph representing a relation according to which an upper torque limit Tmax decreases with increased angular acceleration AX. The torque restriction are enhanced or relaxed by moving the position of a torque axis relative to the graph along the angular acceleration axis while preserving a shape of the graph.
Claims39
A slip control device for use in a vehicle including at least one prime mover for driving a drive shaft of the vehicle, the drive shaft transmitting a driving force of the prime mover to wheels of the vehicle, the slip control device comprising:
- an angular acceleration meter configured to measure an angular acceleration of the drive shaft;
- and
- a torque controller configured to enhance torque restrictions of the drive shaft when the angular acceleration exceeds a specific first threshold value, and to relax the enhanced torque restrictions once the angular acceleration falls below the first threshold value and further satisfies a specific restriction relaxation condition.
A vehicle comprising:
- wheels for moving the vehicle;
- at least one prime mover;
- a drive shaft for transmitting a driving force of the prime mover to the wheels;
- and
- a slip control device, the slip control device comprising:
- an angular acceleration meter configured to measure an angular acceleration of the drive shaft;
- and
- a torque controller configured to enhance torque restrictions of the drive shaft when the angular acceleration exceeds a specific first threshold value, and to relax the enhanced torque restrictions once the angular acceleration falls below the first threshold value and further satisfies a specific restriction relaxation condition.
A slip control method for a vehicle including at least one prime mover for driving a drive shaft of the vehicle, the drive shaft transmitting a driving force of the prime mover to wheels of the vehicle, the method comprising the steps of:
- (a) measuring an angular acceleration of the drive shaft;
- and
- (b) enhancing torque restrictions of the drive shaft when the angular acceleration exceeds a specific first threshold value, and to relax the enhanced torque restrictions once the angular acceleration falls below the first threshold value and further satisfies a specific restriction relaxation condition.
Dependencies are inferred from the claim text.