SPEED CONTROL CIRCUIT FOR UNMANNED GUIDE TYPE CART

摘要

PURPOSE:To slow down the running speed of a cart after detecting that the cart is running at a curve by controlling the target traveling speed signal based on the ratio between the speed signals of the right and left motors detected by a speed detector or the ratio between the speed command signals of the right and left motors. CONSTITUTION:When a cart is running at a curve, a difference of speed is produced between the motors 1 and 2 which drive the left and right drive wheels 10 and 11. Thus it is possible to detect a face that the cart is running a a curve by detecting the speed ratio between both motors 1 and 2. Thus the running speed of the cart can be slowed down at a curve by reducing the target level of the running speed signal of the cart in response to the value of the ratio between the speed signals of both motors 1 and 2. In addition, the running speed of the cart is also slowed down at a curve by reducing the target running speed signal level of the car in response to the value of the ratio between the speed command signals of motors 1 and 2 receives from a steering control circuit 7 without detecting the ratio between the speed signals of both motors 1 and 2.