Un-gripping state determination device for vehicle

Abstract

To provide an un-gripping state determination device improved so as to reduce the possibility of erroneous determination of whether a driver is in an un-gripping state of not, even when an output error of a steering torque sensor occurs due to a factor such as an assembly error of a steering device.SOLUTION: An un-gripping state determination device includes: a torque application device configured to apply control torque to a steering transmission system between a steering wheel and a steered wheel; a steering torque sensor provided in the steering transmission system between the steering wheel and the torque application device; and a control unit configured to determine an un-gripping state in which a driver is not gripping the steering wheel, when steering torque Ts detected by the steering torque sensor is in a first predetermined range (equal to or more than a lower limit value Tr-α and equal to and less than an upper limit value Tr+α); wherein the control unit variably sets the first predetermined range, based on the steering torque detected by the steering torque sensor in a situation where it is determined that the torque is not input to the steering torque sensor.SELECTED DRAWING: Figure 2

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