A/C CUT-OFF CONTROL [SKYACTIV-D 2.2]

id0140z7206200


Outline

•  Controls the A/C operation by switching the A/C relay on/off at the optimal timing according to engine operation conditions. By controlling the A/C operation, acceleration performance and engine reliability have been improved.

Block diagram

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Operation

•  The PCM stops energization to the A/C relay when any of the following conditions is met:

A/C cut-off control operation conditions

Operation condition

A/C relay non-energization time

Purpose
At engine start
Approx. 4 s
To improve startability
At engine restart by i-stop control
Approx. 3 s
To improve startability
Accelerator pedal opening angle 60 % or more (at acceleration)
Approx. 5 s
To improve acceleration performance
At i-stop control switching
—
To improve i-stop function reliability
Refrigerant pressure 3.14 MPa {32.0 kgf/cm2, 455 psi} or more
Until refrigerant pressure decreases to 2.55 MPa {26.0 kgf/cm2, 370 psi} or less
To assure A/C compressor reliability
Refrigerant pressure of 0.196 MPa {2.00 kgf/cm2, 28.4 psi} or less continues for 5 s or more
Until refrigerant pressure of 0.226 MPa {2.30 kgf/cm2, 32.8 psi} or more continues to 5 s or more
To assure A/C compressor reliability
Refrigerant pressure sensor malfunction
—
To assure A/C compressor reliability
Panic braking determined
—
To assure load performance
ECT sensor malfunction
—
Engine protection
Engine coolant temperature 113 °C {235 °F} or more
ON and OFF every 10 s until engine coolant temperature lowers to less than 110 °C {230 °F}
Engine protection
Engine coolant temperature 118 °C {244 °F} or more
Until engine coolant temperature lowers to less than approx. 113 °C {235 °F}
Engine protection
During DPF regeneration control (compulsory DPF regeneration control)
Until DPF regeneration control is completed
To stabilize DPF regeneration control
During fuel injection amount learning (manual)
Until fuel injection amount learning is completed
To stabilize fuel injection amount learning