Driven wheel torque control system

Claim 2

A driven wheel torque control system including a torque converter provided between an internal combustion engine of a vehicle and a driven wheel when slipping of the driven wheel becomes excessive, said system comprising: an internal combustion engine output torque calculating means for calculating an output torque from said internal combustion engine; a driven wheel applied torque calculating means for converting the internal combustion engine output torque calculated by said internal combustion engine output torque calculating means into a driven wheel applied torque by use of a torque ratio of said torque converter; a surplus torque calculating means for calculating a surplus torque consumed for slipping of said driven wheel; a transmittable-torque calculating means for calculating torque transmittable between the driven wheel and a road surface on the basis of output signals from said driven wheel applied torque calculating means and said surplus torque calculating means; a control quantity determining means for calculating a control quantity by use of said transmittable torque; and a driven wheel torque reducing means, responsive to said control quantity, for reducing an output torque of the driven wheel.

Claim 3

A driven wheel torque control system according to claim 1, further including a variable reduction gear provided between said internal combustion engine and said driven wheel, wherein said surplus torque is calculated on the basis of a slip variation rate of the driven wheel and a reduction of said variable reduction gear.

Claim 4

A driven wheel torque control system according to claim 1, wherein said driven wheel torque reducing means comprises: an internal combustion engine output torque controller including, (a) a driven wheel target speed calculating means for calculating a target speed of the driven wheel, (b) an estimated torque ratio calculating means for calculating an estimated torque ratio at a time when said driven wheel torque reducing means is controlled, by use of said driven wheel target speed as an output rotational speed of said torque converter, and (c) a means for correcting the control quantity for said internal combustion engine output torque control means by said estimated torque ratio.

Claim 5

A driven wheel torque control system including a torque converter provided between an internal combustion engine of a vehicle and a driven wheel when slipping of the driven wheel becomes excessive, said system comprising: a driven wheel torque reducing means, responsive to a control quantity, for reducing an output torque of the driven wheel; an internal combustion engine output torque calculating means for calculating an output torque from said internal combustion engine; a driven wheel target speed calculating means for calculating a target speed of said driven wheel; an estimated torque ratio calculating means for calculating an estimated torque ratio at a time when said driven wheel torque reducing means is controlled, by use of said target speed of the driven wheel as an output rotational speed of said torque converter; a driven wheel applied torque calculating means for converting the internal combustion engine output torque calculated by said internal combustion engine output torque calculating means into a driven wheel applied torque by use of said estimated torque ratio; and a control quantity determining means for calculating said control quantity for said driven wheel torque reducing means on the basis of said driven wheel applied torque.

Claim 6

A driven wheel torque control system including a torque converter provided between an internal combustion engine of a vehicle and a driven wheel when slipping of the driven wheel becomes excessive, said system comprising: a driven wheel torque reducing means, responsive to a control quantity, for reducing an output torque of the driven wheel; an internal combustion engine output torque calculating means for calculating an output torque from said internal combustion engine; a driven wheel target speed calculating means for calculating a target speed of said driven wheel; an estimated torque ratio calculating means for calculating an estimated torque ratio at a time when said driven wheel torque reducing means is controlled, by use of said target speed of the driven wheel as an output rotational speed of said torque converter; a driven wheel applied torque calculating means for converting the internal combustion engine output torque calculated by said internal combustion engine output torque calculating means into a driven wheel applied torque by use of said estimated torque ratio; and a control quantity determining means for calculating said control quantity for said driven wheel torque reducing means on the basis of said driven wheel applied torque.

Claim 7

The driven wheel torque control system according to claim 1, wherein said driven wheel torque reducing means includes a pulse motor controlling the opening and closing of a throttle of the internal combustion engine in response to said control quantity.