CALIBRATABLE FAULT REACTIONS IN HEAVY-DUTY DIESEL ENGINES

• US 20080162022A1
• Filed: 11/14/2007
• Published: 07/03/2008
• Est. Priority Date: 12/28/2006
• Status: Active Grant

• Current Assignee: Detroit Diesel Corporation (Daimler Truck Holding AG)
• Original Assignee: Detroit Diesel Corporation (Daimler Truck Holding AG)
• Inventors: Groer, Frank S.
• Granted Patent: US 7,480,559 B2
• Time in Patent Office: Days
• US Class Current: 701/110
• CPC Class Codes: F01N 11/00 Monitoring or diagnostic devices for exhaust-gas treatment apparatus , e.g. for catalytic activity safety, indicating or supervising devices for internal combustion engines F02B77/08; testing of machines G01M13/00
• CPC Class Codes: F01N 13/0097 the purifying devices are arranged in a single housing
• CPC Class Codes: F01N 3/0253 adding fuel to exhaust gases
• CPC Class Codes: F01N 3/035 with catalytic reactors , e.g. catalysed diesel particulate filters
• CPC Class Codes: F01N 3/106 Auxiliary oxidation catalysts
• CPC Class Codes: F02B 37/00 Engines characterised by provision of pumps driven at least for part of the time by exhaust
• CPC Class Codes: F02D 2041/228 Warning displays
• CPC Class Codes: F02D 41/0047 Controlling exhaust gas recirculation [EGR] temperature control with cooler in recirculation circuit F02M26/33
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method to operate an internal combustion engine by derating the engine in response to sensed emissions levels as compared to engine speed and engine torque and logging a fault.

Claims

1. A method to operate an electronic controlled internal combustion engine, said engine equipped with an electronic control unit (ECU) comprised of a Motor Control Module (MCM) and a Computer Powertrain Controller (CPC) each of which have volatile and nonvolatile memory;

said engine further equipped with an exhaust system including an emissions system and sensors in communication with the MCM to transmit data signals indicative of hardware failures or impending hardware failures and exhaust emissions levels;

said method to force a maximum available engine torque and speed whenever an emission related fault is detected;

said method comprising;

a) determining whether a detected error an emission related error;

b) determining whether actual emission at actual engine speed and engine torque is outside a range of calculated emissions at actual engine speed and engine torque stored in memory;

c) de-rating at least said engine torque a predetermined amount as a fault reaction at actual engine speed.

2. The method of claim 1, further including derating said engine speed a predetermined amount corresponding to said fault.

3. The method of claim 1, further including resetting said faults at the first to occur of service, repair of fault condition, and initiation of a new ignition cycle.

4. The method of claim 1, wherein said engine torque is reduced according to a scalar torque multiplier as a function of engine speed.

5. The method of claim 1, wherein said engine torque is reduced by reduction of entire engine torque curve.

6. The method of claim 1, further including activating a warning indicator to alert an operator of a fault condition.

7. The method of claim 1, further including storing each said fault reaction in RAM as a fault react copy and using said fault react copy to initiate said derating.

8. The method of claim 1, wherein said MCM reports said derate available torque to said CPC.

9. The method of claim 1, further including initiating engine shut down in the event said fault indicates a hardware malfunction or failure.