Apparatus for controlling a blower motor
AssigneeDiesel Kiki Co., Ltd.
InventorsToshizo Hara, Shinji Sutoh, Toshio Kojima
Life of this patent
Estimating the term…
Abstract
In an apparatus for controlling the speed of the blower motor in response to the difference between the temperature setting and the temperature inside the vehicle, the maximum speed of the blower motor is limited in accordance with the temperature of engine coolant. Consequently, the quantity of air issuing from the blower is always such that it does not make the passengers feel uncomfortable.
Claims10
An apparatus for controlling the blower motor of a device having a heater core receiving coolant from the engine of a vehicle for heating at least a portion of the air discharged into the passenger compartment of the vehicle, comprising:
- means for producing a first signal having a level varying in accordance with the difference between a desired temperature in the passenger compartment and the actual temperature in the passenger compartment;
- means for generating a second signal having a level proportional to the temperature of the coolant for the engine of the vehicle;
- means responsive to said first and said second signals for producing a control signal having a level varying in accordance with the level of said first signal but limited in accordance with said second signal;
- and
- means responsive to said control signal for driving the blower motor at a speed proportional to the level of the control signal so that the maximum speed of the blower motor is proportional to the temperature of the engine coolant.
An apparatus for controlling the blower motor of a device conditioning the air of a passenger compartment of a vehicle, said device having a duct, an evaporator arranged in the duct for cooling air flowing through the duct, a heater core arranged within the duct for receiving coolant from the engine of the vehicle to heat air flowing through the duct, and a shutter for changing the path of air flow within the duct to change between a heating mode and a cooling mode of the device, comprising:
- means for producing a first signal having a level varying in accordance with the difference between a desired temperature in the passenger compartment and the actual temperature of the passenger compartment;
- means responsive to said first signal for generating a first difference signal the level of which increases in accordance with an increase in the difference between the desired temperature in the passenger compartment and the actual temperature of the passenger compartment;
- means responsive to said first signal for generating a second difference signal the level of which decreases with an increase in the difference between the desired temperature in the passenger compartment and the actual temperature of the passenger compartment;
- means for generating a second signal having a level proportional to the temperature of the coolant of the vehicle engine of the vehicle;
- means responsive to said second signal and said first difference signal for producing a first control signal having a level varying in accordance with the level of said first difference signal but limited by the level of said second signal;
- and
- means associated with said blower motor for driving the blower motor at a speed proportional to the level of said first control signal when the device is used in the heating mode and to the level of said second difference signal when the device is used in the cooling mode.
Dependencies are inferred from the claim text.