Traction control method and apparatus for motor vehicles
First Claim
1. A traction control method for motor vehicles, wherein a slip of a driving wheel which tends to occur when the motor vehicle starts, is detected;
- and an engine output and a braking force imparted to said driving wheel are controlled on the basis of said detection, thereby restraining the slip of said driving wheel, said traction control method comprising the steps of;
selecting a lower speed of lefthand and righthand driving wheel speeds as a control object speed, and comparing said control object speed with a threshold value preset in relation to vehicle speed to control the engine output thereby; and
dividing a brake control period for driving wheels into an initial first control period and a subsequent second control period, wherein during said first control period, a brake control for the respective driving wheels is provided by comparing the respective driving wheel speeds with said threshold value; and
during said second control period, said brake control is performed by comparing the respective driving wheel speeds with a reference speed greater by a predetermined value than said control object speed.
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Accused Products
Abstract
A traction control method/apparatus for motor vehicles is arranged such that at an initial stage of the starting or accelerating operation of the motor vehicle where a large amount of slip of the driving wheel tends to be caused, a braking force is sufficiently applied to the driving wheel to restrain the slip thereof; and after the engine output is adjusted through accelerator or throttle control which is performed simultaneously with the application of the braking force, the procedure for controlling the brake hydraulic pressure is changed to eliminate the difference between the lefthand and righthand driving wheel speeds.
27 Citations
8 Claims
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1. A traction control method for motor vehicles, wherein a slip of a driving wheel which tends to occur when the motor vehicle starts, is detected;
- and an engine output and a braking force imparted to said driving wheel are controlled on the basis of said detection, thereby restraining the slip of said driving wheel, said traction control method comprising the steps of;
selecting a lower speed of lefthand and righthand driving wheel speeds as a control object speed, and comparing said control object speed with a threshold value preset in relation to vehicle speed to control the engine output thereby; and dividing a brake control period for driving wheels into an initial first control period and a subsequent second control period, wherein during said first control period, a brake control for the respective driving wheels is provided by comparing the respective driving wheel speeds with said threshold value; and
during said second control period, said brake control is performed by comparing the respective driving wheel speeds with a reference speed greater by a predetermined value than said control object speed. - View Dependent Claims (2, 3, 4)
- and an engine output and a braking force imparted to said driving wheel are controlled on the basis of said detection, thereby restraining the slip of said driving wheel, said traction control method comprising the steps of;
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5. A traction control method for motor vehicles, wherein a slip of a driving wheel which tends to occur when the motor vehicle accelerates, is detected;
- and an engine output and a braking force imparted to said driving wheel are controlled on the basis of said detection, thereby restraining the slip of said driving wheel, said traction control method comprising the steps of;
selecting a lower speed of lefthand and righthand driving wheel speeds as a control object speed, and comparing said control object speed with a threshold value preset in relation to vehicle speed to control the engine output thereby; and dividing a brake control period for driving wheels into an initial first control period and a subsequent second control period, wherein during said first control period, a brake control for the respective driving wheels is provided by comparing the respective driving wheel speeds with said threshold value; and
during said second control period, said brake control is performed by comparing the respective driving wheel speeds with a reference speed greater by a predetermined value than said control object speed. - View Dependent Claims (6, 7, 8)
- and an engine output and a braking force imparted to said driving wheel are controlled on the basis of said detection, thereby restraining the slip of said driving wheel, said traction control method comprising the steps of;
Specification