# US 4,391,320 A · Method and an apparatus for air conditioning for vehicles by controlling circulation of inside air and introduction of outside air

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- Number: US 4,391,320 A
- Document ID: US4391320A
- Status: Granted
- Kind: A
- Application number: 06/171,030
- Filed: 1980-07-22
- Granted: 1983-07-05
- Earliest claimed: 1979-07-24
- Assignees: Nippondenso Co., Ltd.
- Inventors: Yozo Inoue; Yoji Ito; Kiyoshi Hara; Kiyoshi Usami; Yasuhiro Iwata
- Web page: https://patentgrep.com/patent/US4391320A

## CPC

- G05D 23/1917: {using digital means}
- B60H 1/00842: {the system comprising a plurality of damper doors; Air distribution between several outlets}
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES

## Abstract

A method for air conditioning for vehicles comprising a step of detecting a temperature of a passenger compartment of a vehicle, an atmospheric temperature and a preset temperature in the initial period of air conditioning, a step of judging the results of comparisons between said temperatures and a step of switching between air conditioning by the circulation of inside air and air conditioning by the introduction of outside air.

## Claims

### Claim 1

A method for air conditioning for vehicles with passenger compartments by controlling circulation of inside air and introduction of outside air in which an inlet for inside air and an inlet for outside air are selectively opened and closed, and the circulation of inside air and the introduction of outside air are selectively effected, characterized in that said method comprises: a step of detecting a temperature of a vehicle passenger compartment, atmospheric temperature and a preset temperature in an initial period of air conditioning, a step of judging the results of comparisons between said temperatures, a step of switching between air conditioning by the circulation of inside air and air conditioning by the introduction of outside air, a step of producing an instruction for the introduction of outside air if either the passenger compartment temperature is higher than the atmospheric temperature and higher than a preset temperature or if the passenger compartment temperature is lower than the atmospheric temperature and lower than a preset temperature, and a step of producing an instruction for the circulation of inside air if one of the following conditions is established:
(a) the passenger compartment temperature is higher than the atmospheric temperature and lower than a preset temperature,
(b) the passenger compartment temperature is lower than the atmospheric temperature and higher than a preset temperature.

### Claim 2

Air conditioning apparatus for vehicles with passenger compartments comprising an inlet for inside air and an inlet for outside, means for selectively opening and closing said inlets to selectively effect air conditioning by circulation of inside air and introduction of outside air to the passenger compartment, means for detecting a temperature of the passenger compartment, means for detecting atmospheric temperature and means for setting a preset temperature in an initial period of air conditioning and means for performing comparisons among said temperatures, means for effecting air conditioning in accordance with said comparisons by introduction of outside air if either the passenger compartment temperature is higher than the atmospheric temperature and higher than a preset temperature or if the passenger compartment temperature is lower than the atmospheric temperature and lower than a preset temperature, means for effecting air conditioning in accordance with said comparisons by circulation of inside air if one of the following conditions is established:
(a) the passenger compartment temperature is higher than the atmospheric temperature and lower than a preset temperature,
(b) the passenger compartment temperature is lower than the atmospheric temperature and higher than a preset temperature.

### Claim 3

An apparatus for air conditioning for vehicles by controlling circulation of inside air and introduction of outside air in which an inlet for inside air and an inlet for outside air are selectively opened and closed and the circulation of inside air and the introduction of outside air are selectively effected, characterized in that said apparatus comprises:
means for sensing the temperature of a passenger compartment of a vehicle;
means for sensing atmospheric temperature;
means for presetting a preset temperature;
switch means for causing a start of the air conditioning;
a starter switch of the vehicle;
an inside air switch for instructing inside air circulation; and
computer means for producing a control signal for selectively opening and closing said inlet for inside air or said inlet for outside air in accordance with data supplied by said temperature sensing and presetting means in an initial period of air conditioning, said computer means carrying out a calculation including a step for producing an instruction for outside air introduction if either the passenger compartment temperature is higher than the atmospheric temperature and higher than a preset temperature or if the passenger compartment temperature is lower than the atmospheric temperature and lower than a preset temperature, when said starter switch is in the ON state and either if the passenger compartment temperature is higher than the atmospheric temperature and lower than a preset temperature or if the passenger compartment temperature is lower than the atmospheric temperature and higher than a preset temperature, while producing an instruction for inside air circulation if said inside air switch is in the ON state and producing an instruction for outside air introduction if said inside air switch is in the OFF state and either if the passenger compartment temperature is higher than the atmospheric temperature and higher than a preset temperature or if the passenger compartment temperature is lower than the atmospheric temperature and lower than a preset temperature, when said starter switch is in the OFF state.