Driving force controlling apparatus and method for four-wheel drive vehicle
First Claim
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1. A driving force controlling apparatus for a four-wheel drive vehicle, comprising:
- a front-and-rear wheel driving force distribution control system including a clutch disposed in a midway of an engine driving system of the vehicle through front and rear road wheels of the vehicle, the front-and-rear wheel driving force distribution control system executing a control to modify a driving force distribution ratio between the front and rear road wheels toward an equal-distribution ratio as a clutch engagement force of the clutch becomes stronger;
a road wheel velocity detecting section that detects a road wheel velocity of each of the front and rear road wheels of the vehicle;
a clutch input torque detecting section that detects a clutch input torque inputted from the engine driving system to the clutch;
a clutch transmission torque detecting section that detects a clutch transmission torque which the clutch is enabled to transmit to an output portion of the clutch; and
a clutch force reduction controlling section that outputs a command to the front-and-rear wheel driving force distribution control system to reduce the clutch engagement force of the clutch when a subtraction value of a detected value of the clutch transmission torque from that of the clutch input torque is smaller than a predetermined value and detected wheel velocities of both of left and right road wheels of the vehicle are substantially equal to each other.
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Abstract
In driving force controlling apparatus and method for a four-wheel drive vehicle, a command is outputted to a front-and-rear wheel driving force distribution control system to reduce a clutch engagement force of a clutch such as a frictional clutch when a subtraction value of a detected value of a clutch transmission torque from that of a clutch input torque (Tinp−Tr) is smaller than a predetermined value (δ) and detected wheel velocities of both of left and right road wheels of the vehicle are substantially equal to each other (Vw1±α=Vw2 and Vw3±α=Vw4).
29 Citations
11 Claims
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1. A driving force controlling apparatus for a four-wheel drive vehicle, comprising:
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a front-and-rear wheel driving force distribution control system including a clutch disposed in a midway of an engine driving system of the vehicle through front and rear road wheels of the vehicle, the front-and-rear wheel driving force distribution control system executing a control to modify a driving force distribution ratio between the front and rear road wheels toward an equal-distribution ratio as a clutch engagement force of the clutch becomes stronger;
a road wheel velocity detecting section that detects a road wheel velocity of each of the front and rear road wheels of the vehicle;
a clutch input torque detecting section that detects a clutch input torque inputted from the engine driving system to the clutch;
a clutch transmission torque detecting section that detects a clutch transmission torque which the clutch is enabled to transmit to an output portion of the clutch; and
a clutch force reduction controlling section that outputs a command to the front-and-rear wheel driving force distribution control system to reduce the clutch engagement force of the clutch when a subtraction value of a detected value of the clutch transmission torque from that of the clutch input torque is smaller than a predetermined value and detected wheel velocities of both of left and right road wheels of the vehicle are substantially equal to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A driving force controlling apparatus for a four-wheel drive vehicle, comprising:
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front-and-rear wheel driving force distribution controlling means including a clutch disposed in a midway of an engine driving system of the vehicle through front and rear road wheels of the vehicle, the front-and-rear wheel driving force distribution controlling means executing a control to modify a driving force distribution ratio between the front and rear road wheels toward an equal-distribution ratio as a clutch engagement force of the clutch becomes stronger;
road wheel velocity detecting means for detecting a road wheel velocity of each of the front and rear road wheels of the vehicle;
clutch input torque detecting means for detecting a clutch input torque inputted from the engine driving system to the clutch;
clutch transmission torque detecting means for detecting a clutch transmission torque which the clutch is enabled to transmit to an output portion of the clutch; and
clutch force reduction controlling means for outputting a command to the front-and-rear wheel driving force distribution controlling means to reduce the clutch engagement force of the clutch when a subtraction value of a detected value of the clutch transmission torque from that of the clutch input torque is smaller than a predetermined value and detected wheel velocities of both of left and right road wheels of the vehicle are substantially equal to each other.
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11. A driving force controlling method for a four-wheel drive vehicle, the four wheel drive vehicle comprising a front-and-rear wheel driving force distribution control system including a clutch disposed in a midway of an engine driving system of the vehicle through front and rear road wheels of the vehicle, the front-and-rear wheel driving force distribution control system executing a control to modify a driving force distribution ratio between the front and rear road wheels toward an equal-distribution ratio as a clutch engagement force of the clutch becomes stronger and the driving force controlling method comprising:
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detecting a road wheel velocity of each of the front and rear road wheels of the vehicle;
detecting a clutch input torque inputted from the engine driving system to the clutch;
detecting a clutch transmission torque which the clutch is enabled to transmit to an output portion of the clutch; and
outputting a command to the front-and-rear wheel driving force distribution control system to reduce the clutch engagement force of the clutch when a subtraction value of a detected value of the clutch transmission torque from that of the clutch input torque is smaller than a predetermined value and detected wheel velocities of both of left and right road wheels of the vehicle are substantially equal to each other.
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Specification