1. TECHNICAL FIELD OF THE INVENTION;Commercial vehicle with A-C system;2. The technical problem the invention is trying to solve;In the case of the failure of the conventional A-C system, the circuit configuration is very complicated in the A-C system that uses the air pressure to change the shift gear forcibly, and the expensive PAL IC is used. This is to solve the problem of rising cost.;3. Summary of solution of design;A selection unit 10 for selecting a gear shift stage; A first rectifying unit 40 and a second rectifying unit 60 rectifying a signal of a shift stage selected by the selecting unit 10; A light emitting unit 50 for displaying a shift stage selected by the drive stage signal rectified from the first rectifying unit 40 and the reverse stage (R stage) signal selected by the selection unit 10; Characterized in that it consists of a drive unit 30 for driving the magnet valve in accordance with the voltage rectified from the second rectifier (60).;4. Important uses of the devise;Applied to the gear shift of a car.
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