A/C CUT-OFF CONTROL [SKYACTIV-D 1.8]

id0140s1206200


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

—: Not applicable

Operation condition

A/C relay non-energization time

Purpose
At engine start
Approx. 4 s
To improve startability
Engine restart by i-stop control
Approx. 2 s
To improve startability
Accelerator pedal opening angle 60% or more (at acceleration)
Approx. 5 s
To improve acceleration performance
Accelerating from stop
Approx. 2 s
To improve acceleration performance from stop
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
Ascending high gradient
—
To assure ascent performance
Engine coolant temperature 116 °C {241 °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 117 °C {243 °F} or more
Until engine coolant temperature lowers to less than approx. 113 °C {235 °F}
Engine protection