Flap motors

The flap motors are actuated by the IHKA control unit via the LIN bus and are supplied with power and an earth connection. In the rest state, the control unit switches the power supply off.

The flap motor is fitted with an integrated circuit. This circuit controls the coil of the flap motor. The circuit has bus- and diagnosis capabilities. After activation of the flap motor, the integrated circuit sends position feedback (actual position) to the control unit. The flap motors communicate across the LIN bus with the HKA control unit. The flap motors are switched in series on the LIN bus. Each flap motor is assigned a certain address. The address determines which function the flap motor assumes in the system network. For example, the footwell flap motor knows that messages are being addressed to it via this address (e.g. open flap). This address tells e.g. the IHKA control unit which flap motor has sent it a fault message.

The following flap motors are installed in IHKA-Basic  :

• Air distribution flap motor
• Fresh air/recirculated air flap motor
• Mixing flap motor

Actuation of central kinematics via the air distribution flap motor (IHKA-Basic only)

The air distribution flap motor has the task of setting the air distribution over a cam disc. The air distribution flap motor has no way of recognizing the actual position. To allow the cam disc to be unambiguously positioned despite this, there are two cams of different widths on the cam disc. The micro-switch signals to the IHKA control unit that the cams have been passed over. This mechanism achieves reliable and rapid positioning of the cam disk.

The following flap motors are installed in IHKA-High  :

• Defroster flap motor
• Fresh air/recirculated air flap motor
• Mixing flap motor, left
• Mixing flap motor, right
• Ventilation flap motor
• Footwell flap motor
• Stratification flap motor
• Rear-compartment stratification flap motor