Patent ID: 6798160
Filing Date: 2004-09-28
Classification: B60L,Y02T

Abstract:
An electric working machine comprising: a plurality of drive wheels; a plurality of electric motors for driving the drive wheels to cause the electric working machine to travel along the ground; a speed adjustment member mounted to undergo movement within a range of positions including a neutral range position, a low movement speed range position, an intermediate movement speed range position, and a high movement speed range position; a potentiometer for receiving a voltage which varies in response to movement of the speed adjustment member within the range of positions; and a control unit for controlling the electric motors in accordance with the voltage received by the potentiometer so that the electric working machine stops traveling when the speed adjustment member is in the neutral range position, the electric working machine travels at a low speed while performing a working operation when the speed adjustment member is in the low movement speed range position, the electric working machine travels at an intermediate speed while performing the working operation when the speed adjustment member is in the intermediate movement speed range position, and the electric working machine travels at a high speed without performing the working operation when the speed adjustment member is in the high speed movement range position; wherein a rate of change of the speed of the electric working machine is smaller when the speed adjustment member is in the intermediate movement speed range position than when the speed adjustment member is in each of the low movement speed range position and the high movement speed range position.