Method and system for controlling engine temperature by engine derating
AssigneeDetroit Diesel Corporation
InventorsJohn Edward Longnecker, Leopold Super, Richard Michael Avery, Jr., Brian Lewallen
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Abstract
A method and system for controlling engine temperature by derating torque output of the engine. The method and system operate in cooperation with an electronic control module which is programmable for controlling temperature in the engine by derating maximum engine torque output based on an engine temperature rate of change. This permits the derating to be finely tuned to maximize available torque.
Claims20
A method to control engine temperature by derating engine torque, the method comprising:
- calculating a first delta temperature equal to a difference in temperature between a first engine temperature determined during operation of the engine and a predefined operating temperature limit;
- calculating a first temperature rate of change for the engine, the first temperature rate of change corresponding with a change in engine temperature over a first period of time;
- determining a first torque limiter for use in derating engine torque, the first torque limiter based on the first delta temperature and the first temperature rate of change;
- and
- controlling an engine control module to derate engine torque based on the first torque limiter.
An engine control module for use with a compression-ignition internal combustion engine, the module comprising,
- a means for calculating a first delta temperature equal to a difference in temperature between a first engine temperature determined during operation of the engine and a predefined operating temperature limit;
- a means for calculating a first temperature rate of change for the engine, the first temperature rate of change corresponding with a change in engine temperature over a first period of time;
- a means for determining a first torque limiter for use in derating engine torque, the first torque limiter based on the first delta temperature and the first temperature rate of change;
- and
- a means for derating engine torque based on the first torque limiter.
A system for use with an internal combustion engine to control engine temperature by derating engine torque, the system comprising:
- a sensor for determining a first engine temperature during operation of the engine;
- and
- an engine control module configured to calculate a first temperature rate of change for the engine, the first temperature rate of change corresponding with a change in engine temperature over a first period of time, the engine control module determining a first torque limiter for use in derating engine torque, the first torque limiter based on the first temperature rate of change.
Dependencies are inferred from the claim text.