Imbalance detection device, imbalance detection system, data analysis device, and controller for internal combustion engine

Patent metadata

Field	Value
Publication number	US-11225924-B2
Application number	US-202016785720-A
Country	US
Kind code	B2
Filing date	Feb 10, 2020
Priority date	Feb 21, 2019
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

An imbalance detection device is provided. An obtainment process includes obtaining a rotation waveform variable based on a detection value of a sensor that detects a rotational behavior of a crankshaft, and an air-fuel ratio detection variable in each of a plurality of first intervals. A calculation process includes calculating an imbalance variable based on an output of a mapping having a value obtained by the obtainment process as an input. The imbalance variable indicates a degree of variations in an air-fuel ratio of the internal combustion engine. The rotation waveform variable indicates a difference between instantaneous speed variables that are variables corresponding to the rotational speed of the crankshaft in each of the second intervals.

First claim

What is claimed is:

1. An imbalance detection device applied to a multi-cylinder internal combustion engine, the imbalance detection device comprising:
memory circuitry; and
processing circuitry, wherein
the memory circuitry is configured to store mapping data that is data defining a mapping, the mapping constituting a machine learning algorithm, the mapping data including data learned by machine learning, the mapping including a neural network having an input-side nonlinear mapping that nonlinearly converts each output of an input-side linear mapping and an output-side nonlinear mapping that nonlinearly converts each output of an output-side linear mapping, the mapping having a rotation waveform variable and an air-fuel ratio detection variable as an input, the air-fuel ratio detection variable being a variable corresponding to an output of an air-fuel ratio sensor in each of a plurality of first intervals, and the mapping outputting an imbalance variable that is a variable indicating a degree of variations in an air-fuel ratio of the internal combustion engine,
the processing circuitry is configured to execute
an obtainment process of obtaining the rotation waveform variable based on a detection value of a sensor that detects a rotational behavior of a crankshaft, and the air-fuel ratio detection variable in each of a plurality of first intervals,
a calculation process of calculating the imbalance variable based on an output of the mapping having a value obtained by the obtainment process as the input, and
a response process of operating predetermined hardware based on a calculation result of the calculation process to respond to a large degree of variations in the air-fuel ratio,

the rotation waveform variable is a variable indicating a difference between instantaneous speed variables that are variables corresponding to a rotational speed of the crankshaft in each of a plurality of second intervals,
the first interval and the second interval are both angular intervals of the crankshaft smaller than an appearance interval of a compression top dead center, and
the rotation waveform variables and the air-fuel ratio detection variables, which are inputs to the mapping, are respectively time series data within a predetermined angular interval larger than the appearance interval.

2. The imbalance detection device according to claim 1 , wherein
the input to the mapping includes an operating point variable that is a variable defining an operating point of the internal combustion engine,
the obtainment process includes a process of obtaining the operating point variable, and
the calculation process is a process of calculating the imbalance variable based on the output of the mapping in which the operating point variable obtained by the obtainment process is further included in the input to the mapping.

3. The imbalance detection device according to claim 1 , wherein
the input to the mapping includes moderator variables that are variables for adjusting a combustion speed of an air-fuel mixture in a combustion chamber of the internal combustion engine by an operation of an operation portion of the internal combustion engine,
the obtainment process includes a process of obtaining the moderator variable, and
the calculation process is a process of calculating the imbalance variable based on the output of the mapping in which the moderator variable obtained by the obtainment process is further included in the input to the mapping.

4. The imbalance detection device according to claim 1 , wherein
the input to the mapping includes a driveline system state variable that is a variable indicating a state of a driveline system connected to the crankshaft,
the obtainment process includes a process of obtaining the driveline system state variable, and
the calculation process is a process of calculating the imbalance variable based on the output of the mapping in which the driveline system state variable obtained by the obtainment process is further included in the input to the mapping.

5. The imbalance detection device according to claim 1 , wherein
the rotation waveform variable is configured as a variable indicating a difference between the instantaneous speed variables by the instantaneous speed variable in each of the second intervals,
the obtainment process includes a process of obtaining the instantaneous speed variable in each of the second intervals as the rotation waveform variable, and
the calculation process is a process of calculating the imbalance variable by having the instantaneous speed variable in each of the second intervals as the input to the mapping as the rotation waveform variable.

6. The imbalance detection device according to claim 1 , wherein
the memory circuitry includes a plurality of types of the mapping data, and
the calculation process includes a selection process of selecting the mapping data to be used for calculating the imbalance variable from the plurality of types of mapping data.

7. The imbalance detection device according to claim 1 , wherein
the predetermined hardware includes a combustion operation portion for controlling the combustion of an air-fuel mixture in a combustion chamber of the internal combustion engine, and
the response process includes an operation process of operating the combustion operation portion according to the imbalance variable when the degree of variations in the air-fuel ratio is large.

8. The imbalance detection device according to claim 7 , wherein the operation process includes a process of operating a fuel injection valve serving as the combustion operation portion for supplying fuel to each of a plurality of cylinders.

9. An imbalance detection system comprising the processing circuitry and the memory circuitry according to claim 1 , wherein
the processing circuitry includes first processing circuitry and second processing circuitry,
the first processing circuitry is mounted to a vehicle and is configured to execute
the obtainment process,
a vehicle-side transmission process for transmitting the data obtained by the obtainment process to the outside of the vehicle,
a vehicle-side reception process for receiving a signal based on the calculation result of the calculation process, and
the response process, and

the second processing circuitry is disposed outside the vehicle and is configured to execute
an external reception process for receiving the data transmitted by the vehicle-side transmission process,
the calculation process, and
an external transmission process for transmitting a signal based on the calculation result of the calculation process to the vehicle.

10. The imbalance detection device according to claim 1 , wherein the rotation waveform variable is a variable corresponding to a rotational speed of the crankshaft in each of a plurality of consecutive second intervals included in one of the first intervals.

11. An imbalance detection device applied to a multi-cylinder internal combustion engine, the imbalance detection device comprising:
memory circuitry; and
processing circuitry, wherein
the memory circuitry is configured to store mapping data that is data defining a mapping, the mapping having a rotation waveform variable and an air-fuel ratio detection variable as an input, the air-fuel ratio detection variable being a variable corresponding to an output of an air-fuel ratio sensor in each of a plurality of first intervals, and the mapping outputting an imbalance variable that is a variable indicating a degree of variations in an air-fuel ratio of the internal combustion engine,
the processing circuitry is configured to execute
an obtainment process of obtaining the rotation

Assignees

• Toyota Motor Co Ltd

Inventors

• Muto Harufumi
• Katayama Akihiro
• Mori Kohei
• Hashimoto Yosuke

Classifications

• F02D41/2454 Primary

  Learning of the air-fuel ratio control · CPC title

• F02D41/1454

  the characteristics being an oxygen content or concentration or the air-fuel ratio · CPC title

• F02D41/1405

  Neural network control · CPC title

• F02D41/0085 Primary

  Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio · CPC title

• F02D2200/1012

  Engine speed gradient · CPC title