Temperature control apparatus for a motor vehicle air conditioner
First Claim
1. A temperature control apparatus for use in a motor vehicle air conditioner, the temperature control apparatus comprising:
- an evaporator means;
a heater core means for re-heating air cooled by said evaporator means;
a compressor means for circulating a refrigerant through said evaporator means;
an air mixing means for controlling a ratio of an amount of cooled air passing through said heater core means for re-heating to an amount of cooled air bypassing said heater core means;
a first temperature controlling circuit means for controlling a position of said air mixing means to maintain a temperature of a vehicle chamber at a desired level and for stopping said compressor means immediately prior to said evaporator means being frozen; and
a second temperature controlling circuit means for controlling an operating period of time of said compressor means to maintain the vehicle chamber temperature at said desired level; and
means for selectively switching said first and second temperature controlling circuit means in dependence upon operating conditions of said air conditioner.
1 Assignment
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Accused Products
Abstract
A temperature controlling apparatus is provided for use in systems such as a motor vehicle air conditioner. In the temperature controlling apparatus, a cycling clutch and a re-heated air mixing system are selectively used in accordance with the environmental condition. The cycling clutch system temperature control is effected in summer season to control an operating period of time of a compressor, and the re-heated air mixing system temperature control is effected in spring or autumn season to dehumidify the air and in winter season by means of an air mixing door after stopping the compressor thereby controlling an amount of the intake air which is to be re-heated.
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Citations
11 Claims
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1. A temperature control apparatus for use in a motor vehicle air conditioner, the temperature control apparatus comprising:
an evaporator means;
a heater core means for re-heating air cooled by said evaporator means;
a compressor means for circulating a refrigerant through said evaporator means;
an air mixing means for controlling a ratio of an amount of cooled air passing through said heater core means for re-heating to an amount of cooled air bypassing said heater core means;
a first temperature controlling circuit means for controlling a position of said air mixing means to maintain a temperature of a vehicle chamber at a desired level and for stopping said compressor means immediately prior to said evaporator means being frozen; and
a second temperature controlling circuit means for controlling an operating period of time of said compressor means to maintain the vehicle chamber temperature at said desired level; and
means for selectively switching said first and second temperature controlling circuit means in dependence upon operating conditions of said air conditioner.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A temperature control apparatus for use in a motor vehicle air conditioner, the temperature control apparatus comprising:
an evaporator means;
a heater core means for re-heating air cooled by said evaporator means;
a compressor means for circulating a refrigerant through said evaporator means;
means for detecting an operating state of said evaporator means;
means for generating a reference signal corresponding to a state of said evaporator means immediately before said evaporator means is frozen;
a first temperature controlling circuit means for comparing an output signal of said detecting means with said reference signal to thereby stop an operation of said compressor means immediately before said evaporator means is frozen;
air mixing means for controlling a ratio of an amount of cooled air passing through said heater core means for re-heating to an amount of cooled air bypassing said heater core means;
a position of said air mixing means being controlled to maintain a temperature of a vehicle chamber at a desired level;
a second temperature controlling circuit means for controlling an operating time of said compressor means;
means for fixing said air mixing damper at such a position that an amount of the cooled air bypassing said heater core means becomes maximum;
means for selectively switching said first and second temperature controlling circuit means in accordance with operating conditions of the air conditioner;
an adjustment means for relatively changing comparison levels of the reference signal and the output signal of said detecting means in said first temperature controlling circuit means to thereby stop the operation of said compressor means at a time point appropriately earlier than immediately before when said evaporator means is frozen, said comparison levels being adjusted to control the operating period of said compressor means to thereby maintain the vehicle chamber temperature at a desired level.- View Dependent Claims (10, 11)
Specification