Automatic climate control with tunable transient response

摘要

An improved motor vehicle automatic climate control methodology develops HVAC commands for transient phase operation independent of the HVAC commands calibrated for steady-state phase operation. At system activation, a transient phase indicator is initialized based on the cabin temperature and the set temperature, and thereafter updated to reflect progress toward steady-state phase operation (18). The steady-state HVAC commands are based on ambient conditions and the set temperature (14, 16), and the HVAC commands at system activation are based on the steady-state commands and offsets based on the initial in-car temperature (12, 16, 22, 24, 26). A transient modifier based on the transient phase indicator brings the initial HVAC commands into correspondence with the steady-state HVAC commands as the cabin temperature approaches the set temperature (22, 24, 26). The transient modifier can be an exponential function of the transient phase indicator, and the HVAC commands can be clamped at the initial values until the transient phase indicator reflects a predetermined amount of progress toward the steady-state phase (22). <IMAGE>