Abstract: An apparatus and method to estimate the condition amount of a vehicle tire in a vehicle equipped with vehicle wheels formed with air enclosed under pressure in an inside portion of a tire mounted to a disc wheel. A plurality of wheel speed sensors detect the vehicle speed of each vehicle wheel. An estimating unit obtains a reflected value reflecting the tire condition amount of a vehicle wheel based on the vehicle wheel speed, and estimates the tire condition based upon the reflected value. The estimating unit estimates a reflected value for a first vehicle wheel which is difficult to accurately obtain the reflected value based on the vehicle wheel speed by obtaining the reflected value for a second vehicle wheel which is easier to accurately obtain the reflected value based on the wheel speed.

Abstract: An apparatus and method to estimate the condition amount of a vehicle tire in a vehicle equipped with vehicle wheels formed with air enclosed under pressure in an inside portion of a tire mounted to a disc wheel. A plurality of wheel speed sensors detect the vehicle speed of each vehicle wheel. An estimating unit obtains a reflected value reflecting the tire condition amount of a vehicle wheel based on the vehicle wheel speed, and estimates the tire condition based upon the reflected value. The estimating unit estimates a reflected value for a first vehicle wheel which is difficult to accurately obtain the reflected value based on the vehicle wheel speed by obtaining the reflected value for a second vehicle wheel which is easier to accurately obtain the reflected value based on the wheel speed.

Abstract: An acceleration slip control system for a motor vehicle operates so that a request for the upshift of the transmission of the motor vehicle is not output to upshift device in accordance with a road surface condition detected by road-surface condition detection device, on the basis of the detection results of engine revolution-speed detection device and driving-wheel slip detection device, whereby the inferior acceleration of the motor vehicle attributed to the upshift is prevented in order to perform the optimum gear-shift control conforming to the road surface condition.

Abstract: In an acceleration slip control system for a motor vehicle, a load to act on a differential mounted in the motor vehicle is lightened to prevent the differential from seizing up. In a case where the rotational speed difference of driving wheels detected by a speed difference detector during acceleration slip control is a predetermined value or greater, the method by which the acceleration slip control is performed using a braking control device and an engine output control device is altered by a specified control unit. Braking control and/or engine output control are performed dependent upon the deviation of the speed difference of the wheels from the predetermined value, which can in turn be adjusted dependent upon the load state of the differential.

Abstract: A wheel slip controlling apparatus uses a temperature assuming apparatus to assume a temperature of a brake pad by calculating an increase in temperature of the brake pad due to regular braking operations and braking operations performed for controlling an acceleration slip of a driving wheel. An increase in temperature of a brake pad due to normal braking operations is calculated. This increase in temperature responds to braking deceleration. An increase in temperature of the brake pad due to a braking operation for controlling the acceleration slip of the driving wheel is calculated. This increase in temperature responds to a braking force and a rotational speed of the driving speed. A decrease in temperature of the brake pad when a braking operation is not performed is calculated. This decrease in temperature responds to a rotational speed of the driving wheel. A temperature of the brake pad is assumed in accordance with determinations of vehicle operations.