A/C CUT-OFF CONTROL OPERATION


BHE014000140T44

Operation

• The A/C cut-off control includes the following: A/C cut-off at wide throttle valve opening angle and A/C cut-off at standing start acceleration.

A/C Cut-off at Wide Throttle Valve Opening Angle

Operation condition

• When the throttle valve opening angle exceeds upper, A/C cut-off is activated for approx. 5 s to improve acceleration performance.
• When the throttle valve opening angle is lower or less, A/C cut-off ends.
• When A/C cut-off at wide throttle valve opening angle ends within approx. 5 s and the throttle valve opening angle exceeds upper again, A/C cut-off is inhibited to prevent deterioration of the A/C function.

1
Throttle valve opening angle
2
A/C relay signal
3
A/C cut time
4
Upper
5
Lower
6
ON
7
OFF
8
5 s
9
A/C inhibit

A/C Cut-off at Standing Start Acceleration

• When accelerated from a standing start, A/C cut-off is activated.

A/C Cut-off at High ECT

• When the ECT exceeds 110 °C {230°F} during the A/C operation, the A/C relay alternately turns on and off approx. every 10 s to protect the engine and to prevent deterioration of the A/C function.

1
A/C switch
2
ECT
3
A/C relay
4
ON
5
OFF
6
110°C {230°F}
7
10 s