Abstract: A traction control road simulator (10) is disclosed as having a separate electric motor (12) for controllably applying torque to each axle (14) of a vehicle (16), a speed sensor (46) for determining the speed of each motor (12) and a motor controller (52) for directing each electric motor (12) to apply positive and negative torque to its associated axle (12) to simulate various road conditions in response to the speed signal and according to instructions. A brake (54) is also provided to simulate rapidly changing road conditions.

Abstract: A circuit for providing an indication to the operator of a motor vehicle that the engine or vehicle is operating under conditions likely to produce poor fuel economy. The fuel economy indicating circuit includes a first circuit for generating a first electrical signal having a magnitude proportional to the angular velocity of a component of the vehicle drive train, and a second circuit for generating a second electrical signal having a magnitude proportional to the angular acceleration of a component of the vehicle drive train. A third circuit combines the first and second electrical signals to generate a third signal having a magnitude that is a function of the magnitudes of the first and second electrical signals. An electrically actuable indicating device is controlled by a fourth circuit that is responsive to the magnitude of the third electrical signal to cause actuation of the indicating device when the third electrical signal reaches a predetermined threshold level.