Stall diagnosis apparatus for motor of air conditioning actuator

A stall diagnosis apparatus, comprising:

• a first motor actuating a first door of a Heating, Ventilation and Air Conditioning (HVAC) system of a vehicle;
• a first motor driver connected between a VCC power terminal and the first motor, and driving the first motor by connecting the VCC power terminal to the first motor;
• a first switch and a resistor disposed parallel to the first motor driver and the first motor, wherein one terminal of the first switch is connected to the VCC power terminal and one terminal of the resistor is connected to the ground;
• a first current sensing circuit including a first input terminal connected between the first motor driver and the first motor and a second input terminal connected between the first switch and the resistor, and outputting a first current signal corresponding to a voltage differential between the first and second input terminals;
• a controller, by transmitting a first driving signal to the first motor driver and a second driving signal to the first switch, controlling operation of the first motor and determining whether the first motor is stalled by determining whether a current value of the first current signal outputted from the first current sensing circuit is greater than a first predetermined diagnosis current value;
• a second motor actuating a second door of HVAC system;
• a second motor driver connected between the VCC power terminal and the second motor, and driving the second motor;
• a second switch connected in parallel to the first switch;
• and
• a second current sensing circuit including a third input terminal connected between the second motor driver and the second motor and a further input terminal connected between the second switch and the resistor, and outputting a second current signal corresponding to a voltage differential between the third and fourth input terminals,
• wherein the controller, by transmitting a third driving signal to the second motor driver and a fourth driving signal to the second switch, controlling operation of the second motor and determining whether the second motor is stalled by determining whether a current value of the second current signal outputted from the current sensing circuit is greater than a second predetermined diagnosis current value different from the first predetermined diagnosis current value.