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Cooling Fan Operation Request Control
 
 
DESCRIPTION
A/C amp. controls the cooling fan operation request according to the refrigerant pressure status and vehicle speed status.
noteFor an overview of the cooling fan and information about control. Refer to System Description.
 
 
CONTROL OUTLINE
  • A/C amp. receives the refrigerant pressure sensor signal from ECM via CAN communication and vehicle speed signal from the ABS actuator and electric unit (control unit) via CAN communication.
  • A/C amp. sets one of the optionally determined stages according to the received refrigerant pressure sensor signal and vehicle speed signal.
    noteFor the rules that prescribe the predetermined stages, refer to the following figures.
    • Vehicle speed stages
      Vehicle speed [km/h (MPH)]
      • : 12 (7.5)
      • : 20 (12)
      • : 72 (45)
      • : 80 (50)
    • Refrigerant pressure stages
      Refrigerant pressure [MPa (bar, kg/cm2, psi)]
      • : 0.7 (7.0, 7.1, 102)
      • : 1.0 (10.0, 10.2, 145)
      • : 1.0 (10.0, 10.2, 145)
      • : 1.3 (13.0, 13.3, 189)
      • : 1.3 (13.0, 13.3, 189)
      • : 1.6 (16.0, 16.3, 232)
  • The requested cooling fan operation strength (0%, 35%, 40%, 55%, 85%, 100%) is determined according to the combination of these two stages, and the request signal is transmitted to ECM via CAN communication.