Heating, ventilation, air conditioner performance test system

• US 6,370,891 B1
• Filed: 12/30/1999
• Issued: 04/16/2002
• Est. Priority Date: 12/30/1999
• Status: Expired due to Term

• Current Assignee: FCA US LLC (Stellantis NV)
• Original Assignee: Daimler Chrysler Corporation (Mercedes-Benz Group AG)
• Inventors: Vudrag, Djura, Currier, Ray E Jr., Marshall, Maureen L, Rideout, Dennis K
• Primary Examiner(s): Tapolcal, William E.
• Assistant Examiner(s): Ali, Mohammad M
• Application Number:
  US09/475,622
• Time in Patent Office: 838 Days
• Field of Search: 621/25, 621/29, 621/30, 165/11.1, 236/94
• US Class Current: 62/130
• CPC Class Codes: G05D 23/1905 associated with tele control

Abstract

A heating, ventilation, air conditioner (HEVAC) test system which includes a test unit which determines the temperature of the air exhausted from a HEVAC unit, an ambient temperature unit, and a work cell controller, all of which can be wirelessly interconnected into a network. The vehicle HEVAC unit is tested and passed or failed in accordance with the ambient temperature and the time it takes for the HEVAC exhaust air to vary a predetermined number of degrees. A test probe is also disclosed which ensures proper placement of the temperature sensor and maintains proper placement of the temperature sensor over the test period.

Claims

1. An automated system for testing a heating, ventilation, air conditioner system (HEVAC) unit, comprising:

an ambient test unit, the ambient test unit including an ambient temperature sensor placed in proximity to a vehicle, the ambient temperature sensor generating an ambient temperature signal that varies in accordance with the ambient temperature;

an HEVAC temperature sensor placed in proximity to an HEVAC vent, the HEVAC temperature sensor generating an HEVAC temperature signal that varies in accordance with the temperature of air exhausted from the HEVAC vent;

an HEVAC test controller, the HEVAC test controller varying operation of the HEVAC unit;

a scanner, the scanner generating a scanner signal in response to passing over a tag, the tag being attached to the vehicle and the scanner signal being used to identify feature content of the vehicle; and

an HEVAC test unit, the HEVAC test unit receiving the scanner signal, the HEVAC temperature signal and the ambient temperature signal and determining if the HEVAC temperature is within predefined limits in accordance with the feature content of the vehicle, ambient temperature and the operation of the HEVAC unit.

2. The system of claim 1 further comprising memory for storing information about the HEVAC unit of a particular vehicle, wherein the information is provided to the HEVAC test unit to determine if the HEVAC unit is operating properly.

3. The system of claim 2 further comprising a network for enabling communication between the ambient test unit, the HEVAC test unit, and the memory.

4. The system of claim 3 wherein the network further comprises a wireless interconnection between the ambient test unit, the HEVAC test unit, and the memory.

5. The system of claim 1 wherein the HEVAC temperature sensor defines a primary HEVAC temperature sensor, the HEVAC vent defines a primary HEVAC vent, and the HEVAC temperature signal defines a primary HEVAC temperature signal, the system further comprising a secondary HEVAC temperature sensor, the secondary HEVAC temperature sensor being placed in proximity to a secondary HEVAC vent, the secondary HEVAC temperature sensor generating a secondary HEVAC temperature signal that varies in accordance with the temperature of air exhausted from the secondary HEVAC vent.

6. The system of claim 5 wherein the HEVAC test unit receives the primary and secondary HEVAC temperature signals and the ambient temperature signal and determines if the primary and secondary HEVAC temperatures are within predefined limits in accordance with the ambient temperature and the operation of the HEVAC unit.

7. The system of claim 1 wherein the HEVAC test controller is programmable to provide varying predefined limits.

8. The system of claim 1 wherein the HEVAC test unit and the HEVAC test controller are integrated to provide a single test device.

9. The system of claim 1 wherein the HEVAC system tests an air conditioner system.

10. The system of claim 1 wherein the HEVAC system tests a heating system.

11. The system of claim 1 wherein the HEVAC system tests a heating system and an air conditioner system.

12. An automated system for testing a vehicle heating, ventilation, air conditioner (HEVAC) unit, comprising:

an ambient test unit, the ambient test unit including an ambient temperature sensor placed in proximity to a vehicle, the ambient temperature sensor generating an ambient temperature signal that varies in accordance with the ambient temperature;

an HEVAC temperature sensor placed in proximity to an HEVAC vent, the HEVAC temperature sensor generating an HEVAC temperature signal that varies in accordance with the temperature of air exhausted from the HEVAC vent;

a scanner, the scanner generating a scanner signal in response to passing over a tag, the tag being attached to the vehicle and the scanner signal being used to identify feature content of the vehicle; and

an HEVAC test unit including an HEVAC test controller, the HEVAC test controller varying operation of the HEVAC unit, the HEVAC test unit receiving the scanner signal, the HEVAC temperature signal and the ambient temperature signal and determining if the HEVAC temperature is within predefined limits in accordance with the feature content of the vehicle, ambient temperature and the operation of the HEVAC unit, the HEVAC test unit further, wherein the HEVAC test controller is programmable to vary the predefined limits.

13. The system of claim 12 further comprising memory for storing information about the HEVAC unit of a particular vehicle, wherein the information is provided to the HEVAC test unit to determine if the HEVAC unit is operating properly.

14. The system of claim 13 further comprising a network for enabling communication between the ambient test unit, the HEVAC test unit, and the memory.

15. The system of claim 14 wherein the network further comprises a wireless interconnection between the ambient test unit, the HEVAC test unit, and the memory.

16. The system of claim 15 wherein the HEVAC temperature sensor defines a primary HEVAC temperature sensor, the HEVAC vent defines a primary HEVAC vent, and the HEVAC temperature signal defines a primary HEVAC temperature signal, the system further comprising a secondary HEVAC temperature sensor, the secondary HEVAC temperature sensor being placed in proximity to a secondary HEVAC vent, the secondary HEVAC temperature sensor generating a secondary HEVAC temperature signal that varies in accordance with the temperature of air exhausted from the secondary HEVAC vent.

17. The system of claim 16 wherein the HEVAC test unit receives the primary and secondary HEVAC temperature signals and the ambient temperature signal and determines if the primary and secondary HEVAC temperatures are within predefined limits in accordance with the ambient temperature and the operation of the HEVAC unit.

18. The system of claim 17 wherein the HEVAC system tests at least one of a heating system and an air conditioner system.