Patent US4757944A successfully refreshed from Google Patents.
US4757944A
Expired / Lapsed
US
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Control apparatus of air conditioner for automobiles
Assignee: Hitachi Ltd
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Filing: 1987-04-02
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Granted: 1988-07-19
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Expires: 2007-04-02
Abstract
Abstract A control apparatus of an air conditioner for automobiles comprises: means for calculating a room temperature difference signal; means for calculating a reference blowout temperature; means for correcting the reference blowout temperature, thereby calculating a target blowout temperature; and means for controlling the heat exchanger such that the difference between the target blowout temperature and the actual blowout temperature becomes zero. This control apparatus can always maintain and manage the blowout air temperature at which the passenger can feel most comfortable for various ambient temperature conditions.
Inventors
- 👤 Tsuneo Kagohata
- 👤 Reijiro Takahashi
- 👤 Akira Tezuka
- 👤 Toshikazu Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:30
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00642; B60H1/00814; B60H1/00878; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1917; G05D23/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
192 words
A control apparatus of an air conditioner for automobiles, comprising: a temperature setting apparatus; an outside air temperature detecting apparatus; a room representative point temperature detecting apparatus; a blowout temperature detecting apparatus; an insolation amount detecting apparatus; first means for comparing a set temperature signal from said temperature setting apparatus with a room temperature signal from said room representative point temperature detecting apparatus, thereby calculating a room temperature difference signal; second means for calculating a reference blowout temperature on the basis of an outside air temperature signal from said outside air temperature detecting apparatus; third means for correcting said reference blowout temperature on the basis of the room temperature difference signal calculated by said first means or on the basis of said room temperature difference signal and an insolation amount signal from said insolation amount detecting apparatus, thereby calculating a target blowout temperature; and fourth means for comparing a signal indicative of said target blowout temperature with a blowout temperature signal from said blowout temperature detecting apparatus, thereby changing the heat exchanging capability of the air conditioner such that the difference between the target blowout temperature and the blowout temperature approaches zero.
Claim 2
Dependent Claim
192 words
A control apparatus of an air conditioner for automobiles, comprising: a temperature setting apparatus; an outside air temperature detecting apparatus; a room representative point temperature detecting apparatus; a blowout temperature detecting apparatus; an insolation amount detecting apparatus; first means for comparing a set temperature signal from said temperature setting apparatus with a room temperature signal from said room representative point temperature detecting apparatus, thereby calculating a room temperature difference signal; second means for calculating a reference blowout temperature on the basis of an outside air temperature signal from said outside air temperature detecting apparatus; third means for correcting said reference blowout temperature on the basis of the room temperature difference signal calculated by said first means or on the basis of said room temperature difference signal and an insolation amount signal from said insolation amount detecting apparatus, thereby calculating a target blowout temperature; and fourth means for comparing a signal indicative of said target blowout temperature with a blowout temperature signal from said blowout temperature detecting apparatus, thereby changing the heat exchanging capability of the air conditioner such that the difference between the target blowout temperature and the blowout temperature approaches zero.
Claim 3
Dependent Claim
37 words
A control apparatus according to claim 1, wherein said first means includes an adder, said third means includes a blowout target temperature calculating apparatus, and said fourth means includes a blowout temperature control apparatus and an adder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |