초록 ▼

A drive control device for a motor vehicle with rear axle drive and equipped with an anti-blocking system. As part of a rotational speed sensor arrangement provided to determine the state of movement of the vehicle wheels, each of the non-driving front wheels has an associated rotational speed senso

A drive control device for a motor vehicle with rear axle drive and equipped with an anti-blocking system. As part of a rotational speed sensor arrangement provided to determine the state of movement of the vehicle wheels, each of the non-driving front wheels has an associated rotational speed sensor and the two rear wheels have a common rotational speed sensor, which measures the rotational speed of the propeller shaft in the transmission system. A hydraulic actuator provided for brake pressure control corresponds in construction to that of a 4 channel anti-blocking system. These components are utilized for both the drive control and the anti-blocking control. An electronic control system of the drive control device, which processes the output signals of the rotational speed sensors, initially activates the right-hand rear wheel brake, as soon as a driving wheel starts to spin. If the vehicle does not accelerate in consequence or if, indeed, there is a deceleration of the vehicle, switching occurs to the left-hand driving wheel brake either with a time delay or immediately. If necessary, both driving wheel brakes are activated with a time delay and the engine torque withdrawn. In the case of travel around a curve, the control cycle is introduced by braking the driving wheel on the inside of the curve.

대표청구항 ▼

A drive control for a motor vehicle equipped with an anti-blocking system and wheel rotational speed sensors for determining the state of movement of the driving and non-driving wheels, the drive control providing for control cycles in the course of which a driving wheel which is tending to spin is

A drive control for a motor vehicle equipped with an anti-blocking system and wheel rotational speed sensors for determining the state of movement of the driving and non-driving wheels, the drive control providing for control cycles in the course of which a driving wheel which is tending to spin is slowed down by actuating its associated wheel brake and comprising brake pressure control valves which are individually associated with the brakes of the driving wheels of the vehicle and are electrically controllable into one of a pressure-increasing, a pressure-reducing and a pressure-retaining phase, an electronic control means for processing the output signals from the wheel rotational speed sensors to produce control signals by means of which the brake pressure control valves can be directed into functional positions in the order and combination necessary for drive control, in which positions an auxiliary pressure source is connected to brake calipers of the wheel currently requiring braking and shut off from the brake calipers of the wheel not requiring braking, a first analysis means for processing the output signal from a single rotational speed sensor associated with a drive shaft of the motor vehicle, which is a measure of the sum of the rotational speeds of the vehicle driving wheels, and the output signal from at least one wheel rotational speed sensor, which is a measure of the rotational speed of the non-driving vehicle wheels, for producing an output signal characteristic of the spin tendency of a driving wheel, a second analysis means for processing the output signal from at least one of the wheel rotational speed sensors associated with the non-driving vehicle wheels for producing signals characteristic of the state of movement of the vehicle, and a switch means controlled by switch control signals from a connecting circuit means, the input signals of being the output signals of the first and second analysis means, for providing the following functions within a control cycle: a. at the beginning of a control cycle, initiated by the output signal of the first analysis means indicating that at least one driving wheel is tending to spin, the switch means takes a first position in which only the brake pressure control valve associated with the driving wheels on one side of the vehicle is operable; b. if the output signal from the first analysis means and an acceleration signal from the second analysis means are present simultaneously, indicating that, as a result of activating the brake of the driving wheel of that one side of the vehicle, an acceleration of the vehicle is obtained, the switch means maintains the said switching position in which only the valve associated with the driving wheel on that one side of the vehicle is operable; c. if the output signal from the first analysis means and the output signal from the second analysis means which is characteristic of the steady state of motion condition of the vehicle are present simultaneously, indicating that the state of motion of the vehicle is not affected by the previous activation of the firstly operable brake, then, with a time delay relative to the steady state condition signal, the switch means takes a second switching position for operating the brake pressure control valve on the opposite side of the vehicle; d. if the output signal of the first analysis means and a deceleration signal of the second analysis means are present simultaneously, indicating that activation of the firstly operable brake does not result in the desired acceleration of the vehicle but in a deceleration thereof, the occurrence of the latter moves the switch means into its second position for operating the brake pressure control valve on the opposite side of the vehicle.