As shown, time base circuit 555 and R1, C1, etc. form a monostable timing circuit. After the power switches SA1 and SA2 are turned on, C1 starts charging through R1. After about 1 second, the voltage on C1 is charged to 4V, so that 555 is in a reset state, the 3 pin outputs a low level, and the driving tube VT1 is turned on. The small motor M and the voltage source U1 form a closed loop to be energized, M enters a normal forward rotation, and the electric vehicle travels straight ahead.
When an object collides, the elastic bump switch SA is closed due to the collision, and the charge on C1 is quickly discharged, so that the 2 feet of 555 are at a low potential, 555 is set, and the 3 feet are turned to a high potential, and VT1 is cut off. VT2 is turned on, so that the voltage source U2, the motor M and the VT2 form a closed loop, the M reverses, the trolley reverses or turns.
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