A/C CUT-OFF CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]
A/C CUT-OFF CONTROL [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))]
SM2565338
id0140u0206200
Outline
• To improve drive performance and A/C compressor reliability, the A/C relay is turned off at the appropriate timing according to the engine operation conditions, and the A/C operation is controlled.
Block Diagram
atsuzn00000519
|
Operation
• The PCM stops current to the A/C relay when any of the following conditions is met:
A/C cut-off control operation conditions
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Operation condition |
A/C relay not energized |
Purpose |
|---|---|---|
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At engine start
|
Approx. 4 s
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Improved startability
|
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When engine is restarted by i-stop control
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Approx. 2 s
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Improved startability
|
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When high engine speed (approx. 7,500 rpm or more)
|
—
|
A/C compressor reliability assurance
|
|
Accelerating from stop
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Approx. 3 s
|
Acceleration from standstill performance improvement
|
|
Accelerated
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Approx. 5 s
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Acceleration performance improvement
|
|
Time under i-stop control
|
—
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i-stop function reliability improvement
|
|
Refrigerant pressure 3.14 MPa {32.0 kgf/cm 2, 455 psi} or more
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Refrigerant pressure decreases to 2.55 MPa {26.0 kgf/cm 2, 370 psi} or less
|
A/C compressor reliability assurance
|
|
Refrigerant pressure of 0.196 MPa {2.00 kgf/cm 2, 28.4 psi} or less continues for 5 s or more
|
Refrigerant pressure of 0.226 MPa {2.30 kgf/cm 2, 32.8 psi} or more continues to 5 s or more
|
A/C compressor reliability assurance
|
|
Drive-by-wire control malfunction
|
—
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Reverse driving performance assurance
|
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Panic braking determined
|
—
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Load performance assurance
|
|
ECT sensor malfunction
|
—
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Engine protection
|
|
Refrigerant pressure sensor malfunction
|
—
|
A/C compressor reliability assurance
|
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When high engine coolant temperature (approx. 116 °C {241 °F} or more)
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High engine coolant temperature: Continuously cuts off the A/C, and if the engine coolant temperature decreases, it continues to cut-off the A/C.
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Engine protection
|
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Travel on ascending road
|
—
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Ascent performance improvement
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