In-vehicle device temperature adjustment apparatus

An in-vehicle device temperature adjustment apparatus comprising:

• a first temperature adjustment circuit including a first pump configured to circulate a heat medium as a first heat medium to adjust a temperature of a first in-vehicle device;
• a second temperature adjustment circuit including a second pump configured to circulate the heat medium as a second heat medium to adjust a temperature of a second in-vehicle device;
• a mixing valve mixing the first heat medium flowing in from the first temperature adjustment circuit and the second heat medium flowing in from the second temperature adjustment circuit, at a ratio corresponding to an opening degree, to flow out to each of the first temperature adjustment circuit and the second temperature adjustment circuit as a mixed heat medium;
• a valve opening degree sensor detecting the opening degree of the mixing valve;
• a first inflow temperature sensor detecting, as a first inflow temperature, a temperature of the first heat medium flowing in from the first temperature adjustment circuit to the mixing valve;
• an outflow temperature sensor detecting, as an outflow temperature, a temperature of the mixed heat medium flowing out from the mixing valve to the second temperature adjustment circuit;
• and
• a mixing controller performing opening degree control on the mixing valve to mix the first heat medium and the second heat medium,
• wherein the mixing controller includes
• a target outflow temperature calculator calculating, as a target outflow temperature, a target value of the outflow temperature based on at least the temperature of the second in-vehicle device,
• a flow ratio calculator calculating, as a flow ratio, a ratio of the first heat medium contained in the mixed heat medium flowing out from the mixing valve to the second temperature adjustment circuit, based on a rotational speed of the first pump, a rotational speed of the second pump, and the opening degree of the mixing valve,
• a second inflow temperature calculator calculating, as a second inflow temperature, a temperature of the second heat medium flowing in from the second temperature adjustment circuit to the mixing valve, based on the first inflow temperature, the outflow temperature, and the flow ratio,
• an opening degree correction coefficient calculator calculating an opening degree correction coefficient defining a relationship between the flow ratio and the opening degree, based on the flow ratio and the opening degree of the mixing valve,
• a target flow ratio calculator calculating, as a target flow ratio, a target value of the flow ratio based on the first inflow temperature, the second inflow temperature, and the target outflow temperature,
• a target opening degree calculator calculating a target opening degree of the mixing valve based on the opening degree correction coefficient and the target flow ratio, and
• a valve drive unit performing opening degree control on the mixing valve based on the target opening degree.