IP Library › Granted Patent US 7,918,129
Granted Patent B2
US 7,918,129 · App. 12/245,300 · Granted Apr 5, 2011

Diagnostic systems for cooling systems for internal combustion engines

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Quick Facts
Patent No.
US 7,918,129
App. No.
12/245,300
Granted
Apr 5, 2011
Kind
B2
Abstract

A control system for an engine system includes a temperature sensor and a diagnostic module. The temperature sensor measures an outlet temperature at an outlet of a cooling system. The diagnostic module estimates the cooling fluid temperature, determines the cooling performance based on the outlet temperature and the cooling fluid temperature, and selectively diagnoses a fault in the cooling system based on the cooling performance and a predetermined threshold.

Claims (11)

1. A control system for an engine system comprising:

a temperature sensor that measures an outlet temperature of a gas at an outlet of a cooling system; and

a diagnostic module that estimates a cooling fluid temperature, that determines a cooling performance based on a difference between the outlet temperature and the cooling fluid temperature, and that selectively diagnoses a fault in the cooling system based on the cooling performance and a predetermined threshold.

2. The control system of claim 1 wherein the diagnostic module estimates the cooling fluid temperature based on an intake air temperature.

3. The control system of claim 2 wherein the cooling system includes a charge air cooler (CAC).

4. The control system of claim 2 wherein the predetermined threshold is determined based on a vehicle speed and a mass air flow rate.

5. The control system of claim 1 wherein the diagnostic module estimates the cooling fluid temperature based on an engine coolant temperature of an engine cooling apparatus.

6. The control system of claim 5 wherein the cooling system is includes an exhaust gas recirculation cooler (EGC).

7. The control system of claim 5 wherein the predetermined threshold is based on an engine speed and a mass air flow rate.

8. The control system of claim 1 wherein the diagnostic module determines a fault in the cooling system when the cooling performance is below the predetermined threshold.

9. The control system of claim 1 wherein the diagnostic module does not communicate with a temperature sensor at an inlet of the cooling system.

Assignments (12)
RELEASE OF SECURITY INTEREST Recorded Nov 7, 2014
From: WILMINGTON TRUST COMPANY
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 034384/0758 →
CHANGE OF NAME Recorded Feb 10, 2011
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 025781/0245 →
SECURITY AGREEMENT Recorded Nov 8, 2010
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: WILMINGTON TRUST COMPANY
Reel/Frame 025324/0515 →
RELEASE OF SECURITY INTEREST Recorded Nov 5, 2010
From: UAW RETIREE MEDICAL BENEFITS TRUST
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025315/0046 →
RELEASE OF SECURITY INTEREST Recorded Nov 4, 2010
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 025245/0909 →
SECURITY AGREEMENT Recorded Aug 28, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UAW RETIREE MEDICAL BENEFITS TRUST
Reel/Frame 023162/0237 →
SECURITY AGREEMENT Recorded Aug 27, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 023156/0313 →
RELEASE OF SECURITY INTEREST Recorded Aug 21, 2009
From: UNITED STATES DEPARTMENT OF THE TREASURY
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023126/0914 →
RELEASE OF SECURITY INTEREST Recorded Aug 21, 2009
From: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 023155/0769 →
SECURITY AGREEMENT Recorded Apr 16, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: CITICORP USA, INC. AS AGENT FOR BANK PRIORITY SECURED PARTIES; CITICORP USA, INC. AS AGENT FOR HEDGE PRIORITY SECURED PARTIES
Reel/Frame 022554/0538 →
SECURITY AGREEMENT Recorded Feb 3, 2009
From: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
To: UNITED STATES DEPARTMENT OF THE TREASURY
Reel/Frame 022201/0363 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 3, 2008
From: COPPOLA, JOHN; DELEON, JOSE L.; DIXON, JAMES M.
To: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
Reel/Frame 021631/0428 →