Patent US4757693A successfully refreshed from Google Patents.
US4757693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning system for a motor vehicle
Assignee: Renault SA
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Filing: 1987-04-22
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Granted: 1988-07-19
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Expires: 2007-04-22
Abstract
Abstract The invention relates to an air conditioning system for a motor vehicle, including a cooling circuit equipped with a compressor (1) associated with a clutch (8), a condenser (2), a pressure reducer (4) and an evaporator (5). An electric circuit (22) has mounted therein, in series, a coil of the clutch (8), a pressure contact (10) for measuring the excess pressure of the cooling circuit, a pressure contact (11) for measuring the underpressure in the cooling circuit, a thermostat (13), and a shunt and detector (18, 19) for monitoring the electric continuity of the circuit. An electronic control circuit (20) controls, in case of electric interruption, an electric display component (21) mounted on the dashboard of the vehicle.
Inventors
- 👤 Philippe Charriau
- 👤 Francois Bancon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:38
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/32; B60H1/3204; B60H1/3225
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
153 words
An air conditioner system for a vehicle, comprising: a cooling circuit comprising a compressor having an electromagnetic clutch, a condenser, an excess pressure sensor, an underpressure sensor, a pressure reducer, and an evaporator having a thermostat; an electrical circuit including, in series, a coil of said clutch, a contact of said excess pressure sensor, a contact of said underpressure sensor, a stop-start contact, said thermostat and means for monitoring the continuity of said electrical circuit; an electric display component mounted on said vehicle; and digital control means responsive to a detection of an interruption of said electrical circuit by said monitoring means for providing an interruption display signal to said display component, wherein said monitoring means comprise a shunt in said electrical circuit between said stop-start contact and one of said sensors, and a digital detection circuit means connected to the terminals of said shunt for outputting a signal to said control means.
Claim 2
Dependent Claim
153 words
An air conditioner system for a vehicle, comprising: a cooling circuit comprising a compressor having an electromagnetic clutch, a condenser, an excess pressure sensor, an underpressure sensor, a pressure reducer, and an evaporator having a thermostat; an electrical circuit including, in series, a coil of said clutch, a contact of said excess pressure sensor, a contact of said underpressure sensor, a stop-start contact, said thermostat and means for monitoring the continuity of said electrical circuit; an electric display component mounted on said vehicle; and digital control means responsive to a detection of an interruption of said electrical circuit by said monitoring means for providing an interruption display signal to said display component, wherein said monitoring means comprise a shunt in said electrical circuit between said stop-start contact and one of said sensors, and a digital detection circuit means connected to the terminals of said shunt for outputting a signal to said control means.
Claim 3
Dependent Claim
12 words
The system of claim 1 wherein said control means is a microprocessor.
References Cited (Backward Citations)
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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 |