Traction slip control device

Claim 1

A traction slip control device for use with an automotive vehicle, said device comprising a sensor for detecting a beginning slip condition on at least one of the driving wheels of the vehicle and for issuing a slip signal when such condition is detected, an auxiliary drive for actuating the throttle valve of the vehicle drive engine in the closing sense and a control circuit responsive to said slip signal for operating said auxiliary drive, said auxiliary drive comprising a hydraulic control element having a hydraulic cylinder and a hydraulic piston slidable therein, a piston rod extending from a bore in an end wall of the cylinder and being coupled to an actuating linkage associated with the throttle valve, a cylinder chamber adjacent said piston for reserving hydraulic pressure which causes said piston rod to act on said actuating linkage to operate the throttle valve in the closing sense, a rod assembly located on the side of said piston opposite said piston rod and being operative by an accelerator pedal in the vehicle, a compensating spring between said piston and said rod assembly which permits movement of the piston under the influence of hydraulic pressure in said chamber for moving said piston and said piston rod toward said rod assembly and for moving said actuating linkage to close the throttle valve, wherein the rod assembly comprises an actuating rod which extends through a bore in an end wall of the cylinder opposite the piston rod for connection to the accelerator pedal in the vehicle, said actuating rod being slidable into the cylinder, the end of the actuating rod disposed inside the cylinder being connected via said compensating spring to said piston, a tension element arranged between the piston and the actuating rod and in parallel relation with said compensating spring for maintaining a predetermined bias of the compensating spring without inhibiting compression of the compensating spring; and wherein a guiding piston is slidingly accommodated in the cylinder and is affixed to the end of the actuating rod inside the cylinder, said compensating spring extending between said hydraulic piston and said guiding piston.