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A/C CUT-OFF CONTROL [SKYACTIV-G 2.0]

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2016 – MX-5 – Engine

A/C CUT-OFF CONTROL [SKYACTIV-G 2.0]

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

Operation

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

A/C cut-off control operation conditions—: Not applicable

Operation condition

While A/C relay not energized

Purpose

At engine start

Approx. 4 s

Improved startability

When high engine speed (approx. 6,700 rpm or more)

A/C compressor reliability assurance

Accelerated

Approx. 5 s

Acceleration from standstill/acceleration performance improvement

Refrigerant pressure 3.14 MPa {32.0 kgf/cm2, 455 psi} or more

A/C compressor reliability assurance

Refrigerant pressure of 0.196 MPa {2.00 kgf/cm2, 28.4 psi} or less continues for 5 s or more

A/C compressor reliability assurance

Drive-by-wire control malfunction

Reverse driving performance assurance

Panic braking determined

Load performance assurance

ECT sensor No.1 malfunction

Engine protection

When high engine coolant temperature (approx. 113 °C {235 °F} or more)

Cuts off the A/C intermittently, and if the engine coolant temperature does not decrease, cuts off the A/C continuously.

Engine protection

Travel on ascending road

Ascent performance improvement

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