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