Patent ID: 7975786

Claim:
An electric ground working vehicle comprising: a left wheel and a right wheel, being main driving wheels, which are independently driven by a left electric motor and a right electric motor respectively; at least one caster, being a steering control wheel, which is freely steerable; a working apparatus driven for ground working; an acceleration operating element for performing acceleration instructions; a turn operating element for performing turn instructions; and a control unit; wherein the control unit controls force applied to the wheels, being the brake force or driving force of the wheels, so that the rotating speed of a wheel at the inside of a turn, of the left wheel and the right wheel, can be made lower than the rotating speed of the wheel at the outside of a turn, when the acceleration operating element is not operated during traveling, and turn instructions are inputted from the turn operating element; wherein the control unit controls a brake driving unit so that electric power is sent from the left electric motor and the right electric motor to an electrical load when the acceleration operating element is not operated during traveling to brake the left wheel and the right wheel by the sending of the electric power to the load, and controls the brake force of the wheels so that the brake force of the wheel at the inside of a turn, of the left wheel and the right wheel, can be greater than the brake force of the wheel at the outside of a turn when the acceleration operating element is not operated during traveling and turn instructions are inputted from the turn operating element.