Engine diagnosis method and engine diagnosis device
AssigneeNissan Motor Co., Ltd.
InventorsSatoshi Nakazawa, Isei Matsuzaki
Life of this patent
Estimating the term…
Abstract
An engine diagnosis method includes: a step of calculating a corrected command torque Ttrg2 by correcting a command torque Ttrg of an engine 1 with a correction amount according to a response characteristic of an engine torque T actually output with respect to the command torque Ttrg; and a step of diagnosing a state of the engine torque T by comparing a diagnostic torque Tdia defined based on the corrected command torque Ttrg2 and an estimated torque Tact. Particularly, in this engine diagnosis method, the correction amount is adjusted with reference to an operating state of the engine 1.
Claims6
An engine diagnosis method, comprising:
- a step of calculating a corrected command torque by correcting a command torque of an engine according to a response characteristic of an estimated value of engine torque actually output with respect to the command torque, wherein calculating the corrected command torque comprises:
- determining whether the engine torque is in an increasing state or a decreasing state based on an amount of change in the engine torque;
- upon determining that the engine torque is in the increasing state, applying a filter defined by a first filter parameter to the command torque;
- and
- upon determining that the engine torque is in the decreasing state, applying a filter defined by a second filter parameter to the command torque;
- a step of diagnosing a state of the engine torque by comparing a diagnostic torque defined based on the corrected command torque to the estimated value;
- and
- a step of limiting the engine torque to a value smaller than the command torque upon determining that the estimated value exceeds the diagnostic torque.
An engine diagnosis device comprising a processor programmed to:
- calculate a corrected command torque by correcting a command torque of an engine according to a response characteristic of an estimated value of engine torque actually output with respect to the command torque, wherein calculating the corrected command torque comprises:
- determining whether the engine torque is in an increasing state or a decreasing state based on an operating state of the engine, the operating state of the engine including an amount of change in the engine torque;
- upon determining that the engine torque is in the increasing state, applying a filter defined by a first filter parameter to the command torque;
- and
- upon determining that the engine torque is in the decreasing state, applying a filter defined by a second filter parameter to the command torque;
- diagnose a state of the engine torque by comparing a diagnostic torque defined based on the corrected command torque to the estimated value;
- limit the engine torque to a value smaller than the command torque upon determining that the estimated value exceeds the diagnostic torque;
- and.
Dependencies are inferred from the claim text.