Control apparatus for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10436141-B2
Application number	US-201715635348-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	Oct 5, 2016
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

By calculating a throttle opening learning value based on an actual effective opening area calculated based on the actual flow rate of intake air and an actual throttle opening with respect to variations caused by type differences of throttle valves and by calculating a throttle opening learning completion range indicating the region for which throttle opening learning completion has been determined based on the state of deviation between an effective opening area corrected by throttle opening learning and the actual effective opening area, control that applies the throttle opening learning value or fail-safe of an air flow sensor is performed in a contiguous throttle opening learning completion range.

First claim

What is claimed is:

1. A control apparatus for internal combustion engines comprising:
a throttle valve that is provided in an intake passage of an internal combustion engine;
an operating state detection sensor including a throttle opening detection sensor that detects an actual opening of the throttle valve,
an intake air flow rate detection sensor that detects an actual flow rate of intake air supplied to the internal combustion engine,
an intake manifold pressure detection sensor that detects a pressure between the throttle valve and the internal combustion engine as an intake manifold pressure and
an intake air temperature detection sensor that detects a temperature of intake air between the throttle valve and the atmosphere
the operating state detection sensor detecting an operating state of the internal combustion engine; and
a processor that receives output information from the operating state detection sensor,
wherein the processor is configured to:
variably control a flow rate of intake air supplied to the internal combustion engine by changing an effective opening area of the intake passage by controlling an opening of the throttle valve,
calculate an actual effective opening area corresponding to an actual throttle opening detected by the throttle opening detection sensor by applying the actual flow rate of intake air, the intake manifold pressure, and the intake air temperature to a flow rate formula for a throttle type flow meter,
learn a correlation between the effective opening area and the throttle opening based on a correlation map between the effective opening area and the throttle opening prepared in advance, the actual effective opening area, and the actual throttle opening and calculates a throttle opening learning value, the throttle opening learning value corresponding to a learned effective opening area and a learned flow rate of intake air,
determine whether a deviation is equal to or less than a predetermined value, the deviation being obtained based on the correlation map between the effective opening area and the throttle opening learning value, the actual effective opening area, and the actual throttle opening, the deviation being at least one from among: a deviation between the throttle opening learning value and the actual throttle opening, a deviation between the learned effective opening area and the actual effective opening area, and a deviation between the learned flow rate of intake air and the actual flow rate of intake air, wherein the processor is configured to determine that learning has been completed for the actual throttle opening in response to determining that the deviation is equal to or less than the predetermined value;
determine whether the actual throttle opening falls within the range of a contiguous throttle opening region for which the processor has already determined that learning has been completed; and
update a throttle opening learning completion range when the processor has determined the completion of learning for the actual throttle opening and the processer has determined that the actual throttle opening falls outside the range, and

wherein, in response to the throttle opening learning value being present in the throttle opening learning completion range updated by the processer, the processer is further configured to use the throttle opening learning value to calculate a target throttle opening and control the throttle valve.

2. The control apparatus for internal combustion engines according to claim 1 ,
wherein the deviation determined by the processor is the deviation between the throttle opening learning value and the actual throttle opening.

3. The control apparatus for internal combustion engines according to claim 1 ,
wherein the deviation determined by the processor is the deviation between the learned effective open area and the actual effective opening area.

4. The control apparatus for internal combustion engines according to claim 1 ,
wherein the deviation determined by the processor is a plurality of deviations including the deviation between the throttle opening learning value and the actual throttle opening, the deviation between the learned effective opening area and the actual effective opening area, and the deviation between the learned flow rate of intake air and the actual flow rate of intake air.

5. The control apparatus for internal combustion engines according to claim 1 ,
wherein the throttle opening learning completion range is a range between a learning completion range maximum value that is the maximum value in the contiguous throttle opening region for which completion of learning of the throttle opening has been determined and a learning completion range minimum value that is the minimum value in the contiguous throttle opening region.

6. The control apparatus for internal combustion engines according to claim 1 ,
wherein, when learning has been determined to be completed for the actual throttle opening and when the actual throttle opening falls outside the throttle opening learning completion range, if the actual throttle opening is larger than the maximum value in the throttle opening learning completion range, the processor increases the maximum value in the throttle opening learning completion range and,
if the actual throttle opening is smaller than the minimum value of the throttle opening learning completion range, the processor reduces the minimum value in the throttle opening learning completion range.

7. The control apparatus for internal combustion engines according to claim 1 ,
wherein, when the actual throttle opening falls within the throttle opening learning completion range, completion of learning is determined,
when the actual throttle opening falls outside the throttle opening learning completion range, incompletion of learning is determined, and
whether to use the throttle opening learning value to calculate a target throttle opening and control the throttle valve is determined depending on determination of completion of learning.

8. The control apparatus for internal combustion engines according to claim 1 ,
wherein, when the actual throttle opening falls within the throttle opening learning completion range, fail-safe of the intake air flow rate detection sensor is performed in consideration of the throttle opening learning value.

Assignees

• Mitsubishi Electric Corp

Inventors

• Watanuki Takuo
• Hagari Hideki

Classifications

• F02D2200/0406

  Intake manifold pressure · CPC title

• F02M35/1038

  for temperature or pressure · CPC title

• F02D41/0002 Primary

  Controlling intake air · CPC title

• F02D2250/16

  End position calibration, i.e. calculation or measurement of actuator end positions, e.g. for throttle or its driving actuator · CPC title

• F02D41/2464

  Characteristics of actuators · CPC title