Driving force control device and driving force control method
First Claim
1. A driving force control device for a vehicle includinga drive source that is connected to a drive wheel of the vehicle via a speed reduction mechanism and a drive shaft, and is configured to generate a torque for braking or driving the drive wheel, anda drive wheel speed sensor configured to detect a rotational speed of the drive wheel, the driving force control device comprising a controller configured to:
- calculate a vehicle body speed of the vehicle;
calculate, based on the calculated vehicle body speed and the detected drive wheel speed, a slip ratio of the drive wheel;
reduce, when the calculated slip ratio is a predetermined slip ratio, a driving torque of the drive source to suppress a slip state of the drive wheel, andcontrol the slip ratio of the drive wheel within an area of the slip ratio smaller than a slip ratio corresponding to a peak value of a road surface friction coefficient in a characteristic of the road surface friction coefficient with respect to the slip ratio of the drive wheel, such that the slip ratio of the drive wheel does not exceed the slip ratio corresponding to the peak value.
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Accused Products
Abstract
Provided is a driving force control device capable of stabilizing a vehicle behavior when a driving torque of a drive wheel is controlled. When slip suppression control is carried out to decrease a driving torque of a drive source that is connected to the drive wheel of a vehicle via a speed reduction mechanism and a drive shaft, and is configured to generate a torque for braking or driving the drive wheel, to thereby suppress a slip state of the drive wheel, the driving torque of the drive source is controlled so that a slip ratio of the drive wheel is in an area of the slip ratio smaller than a slip ratio corresponding to a peak value of a road surface friction coefficient in a characteristic of the road surface friction coefficient with respect to the slip ratio.
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Citations
20 Claims
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1. A driving force control device for a vehicle including
a drive source that is connected to a drive wheel of the vehicle via a speed reduction mechanism and a drive shaft, and is configured to generate a torque for braking or driving the drive wheel, and a drive wheel speed sensor configured to detect a rotational speed of the drive wheel, the driving force control device comprising a controller configured to: -
calculate a vehicle body speed of the vehicle; calculate, based on the calculated vehicle body speed and the detected drive wheel speed, a slip ratio of the drive wheel; reduce, when the calculated slip ratio is a predetermined slip ratio, a driving torque of the drive source to suppress a slip state of the drive wheel, and control the slip ratio of the drive wheel within an area of the slip ratio smaller than a slip ratio corresponding to a peak value of a road surface friction coefficient in a characteristic of the road surface friction coefficient with respect to the slip ratio of the drive wheel, such that the slip ratio of the drive wheel does not exceed the slip ratio corresponding to the peak value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A driving force control device for a vehicle including
a drive source that is connected to a drive wheel of the vehicle via a speed reduction mechanism and a drive shaft, and is configured to generate a torque for braking or driving the drive wheel, and a drive wheel speed sensor configured to detect a rotational speed of the drive wheel, the driving force control device comprising a controller configured to: -
calculate a vehicle body speed of the vehicle; calculate, based on the calculated vehicle body speed and the detected drive wheel speed, a slip ratio of the drive wheel; reduce, when the calculated slip ratio is a predetermined slip ratio, a driving torque of the drive source to suppress a slip state of the drive wheel, and control the slip ratio of the drive wheel, in a μ
-s characteristic representing a relationship of a road surface friction coefficient with respect to the slip ratio of the drive wheel, within an area where a change in the slip ratio of the drive wheel is in an increase direction and the road surface friction coefficient is in an increase direction, or within an area where the change in the slip ratio of the drive wheel is in a decrease direction and the road surface friction coefficient is in a decrease direction, such that the slip ratio of the drive wheel does not exceed the slip ratio corresponding to a peak value of the road surface friction coefficient in the μ
-s characteristic. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A driving force control method of controlling a torque of a motor that is connected to a drive wheel of a vehicle via a speed reduction mechanism and a drive shaft, and is configured to brake or drive the drive wheel, the driving force control method comprising:
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controlling the torque of the motor so that a slip ratio of the drive wheel is controlled, in a μ
-s characteristic representing a relationship of a road surface friction coefficient with respect to a slip ratio of the drive wheel, andcontrolling the slip ratio of the drive wheel within an area where a change in the slip ratio of the drive wheel is in an increase direction and the road surface friction coefficient is in an increase direction, or within an area where the change in the slip ratio of the drive wheel is in a decrease direction and the road surface friction coefficient is in a decrease direction, such that the slip ratio of the drive wheel does not exceed the slip ratio corresponding to a peak value of the road surface friction coefficient in the μ
-s characteristic. - View Dependent Claims (18, 19, 20)
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Specification