Vehicular air conditioning system
First Claim
1. A vehicular air conditioning system comprising:
- an air conditioning compressor driven by an AC motor of three or more phases;
an inverter for converting an output of a vehicular power supply into AC power to control the AC motor, the inverter having three or more output lines for supplying the AC power to each phase of the AC motor;
an electrical heating unit connected to one of the output lines of the inverter so that vehicular power is supplied to the electrical heating unit through the one of the output lines of the inverter;
a switching unit for switching power from the one of the output lines of the inverter to the electrical heating unit;
signal generating means for generating an instruction signal to turn on the switching unit; and
control means for reducing an output voltage of the invertor in response to the instruction signal prior to actuating the switching unit to switch the power to the electrical heating unit.
2 Assignments
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Accused Products
Abstract
To provide a vehicular air conditioning system for activating an electric heater with the output coming from an inverter by actuating a relay at a reasonable cost, a relay and an electric heater acting as electric heat source are connected in series between an output line of three output lines of an inverter and the negative side of a vehicular power supply. The electric heater employs a nichrome wire as its heating element and is used for warming the inside of a vehicle compartment. Moreover, the relay is turned ON/OFF after the output voltage of the inverter is set to zero. As a result, the durability of the relay can be improved, and this relay can be implemented by an existing one without newly manufacturing any dedicated relay so that the cost can be lowered.
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Citations
20 Claims
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1. A vehicular air conditioning system comprising:
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an air conditioning compressor driven by an AC motor of three or more phases; an inverter for converting an output of a vehicular power supply into AC power to control the AC motor, the inverter having three or more output lines for supplying the AC power to each phase of the AC motor; an electrical heating unit connected to one of the output lines of the inverter so that vehicular power is supplied to the electrical heating unit through the one of the output lines of the inverter; a switching unit for switching power from the one of the output lines of the inverter to the electrical heating unit; signal generating means for generating an instruction signal to turn on the switching unit; and control means for reducing an output voltage of the invertor in response to the instruction signal prior to actuating the switching unit to switch the power to the electrical heating unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 16, 17)
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8. A vehicular air conditioning system comprising:
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an air conditioning compressor driven by an AC motor of three or more phases; an inverter for converting an output of a vehicular power supply into AC power to control the AC motor, the inverter having three or more output lines for supplying the AC power to each phase of the AC motor; an electrical heating unit connected to one of the output lines of the inverter so that vehicular power is supplied to the electrical heating unit through the one of the output lines of the inverter; a relay for switching power from the inverter to the electrical heating unit, the relay having electrical contacts provided at one of the output lines from the inverter to the AC motor; a signal generating means for generating an instruction signal for turning on the relay; and control means for stopping the AC motor in response to the instruction signal generated by the signal generating means prior to when the relay is turned on to energize the electrical heating unit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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18. A vehicular air conditioning system comprising:
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an air conditioning compressor driven by an AC motor having three or more phases; an inverter for converting an output of a vehicular power supply into AC power to control the AC motor, the inverter having three or more output lines for supplying the AC power to each phase of the AC motor; an electrical heating unit connected to one of the output lines of the inverter so that the vehicular power is supplied to the electrical heating unit through the one of the output lines of the inverter; a switching unit for opening and closing an electrical circuit for electrically connecting the one of the output lines of the inverter and the electrical heating unit and for electrically connecting the electrical heating unit and the ground so that one end of the electrical heating unit is coupled to the one end of the output lines of the inverter and the other end of the electrical heating unit is grounded, the switching unit being disposed in the electrical circuit; signal generating means for generating an instruction signal to close the electrical circuit by the switching unit; and control means for reducing power supplied to the one of the output lines of the inverter prior to the switching unit closing the electrical circuit to energize the electrical heating unit. - View Dependent Claims (19, 20)
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Specification