State detection system for internal combustion engine, data analysis device, and vehicle

Patent metadata

Field	Value
Publication number	US-11255282-B2
Application number	US-202016785760-A
Country	US
Kind code	B2
Filing date	Feb 10, 2020
Priority date	Feb 15, 2019
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A state detection system for an internal combustion engine is provided. Rotation waveform variables include information on a difference between cylinders in the rotational speed of a crankshaft during periods in which the respective cylinders generate combustion torque. An obtainment process obtains a value of the rotation waveform variables and a value of a road surface state variable based on an output of a sensor that detects a state of the road surface. A selection process selects, from a plurality of types of mapping data stored in the storage device, the mapping data that is associated with the road surface state variable as the detection mapping. A determination process determines whether the engine is in a predetermined operating state based on an output value of the selected detection mapping that takes the rotation waveform variables as inputs.

First claim

What is claimed is:

1. A state detection system for an internal combustion engine, the state detection system being configured to be used for the internal combustion engine mounted on a vehicle to detect a predetermined operating state of the internal combustion engine that is accompanied by variations in combustion state among cylinders, the state detection system comprising:
a storage device configured to store a plurality of types of mapping data as mapping data defining a detection mapping, wherein
the plurality of types of mapping data is classified according to a state of a road surface on which the vehicle travels,
the detection mapping takes, as inputs, rotation waveform variables to output a combustion state variable,
the detection mapping is a mapping that is learned by machine learning,
the rotation waveform variables include information on a difference between cylinders in rotational speed of a crankshaft of the internal combustion engine during periods in which the respective cylinders generate combustion torque, and
the combustion state variable relates to a level of variations in combustion state among the cylinders; and

an execution device configured to perform an obtainment process, a selection process, and a determination process, wherein
the obtainment process obtains values of the rotation waveform variables based on an output of a sensor that detects rotational behavior of the crankshaft, and obtains a value of a road surface state variable based on an output of a sensor that detects a state of the road surface,
the road surface state variable relates to a state of the road surface,
the selection process selects, as the detection mapping, the mapping data that is associated with the road surface state variable obtained in the obtainment process from the plurality of types of mapping data stored in the storage device, and
the determination process determines whether the internal combustion engine is in the predetermined operating state based on an output value of the detection mapping that is selected in the selection process and takes, as inputs, the values of the rotation waveform variables obtained in the obtainment process.

2. The state detection system for an internal combustion engine according to claim 1 , wherein the predetermined operating state is a state in which a misfire has occurred.

3. The state detection system for an internal combustion engine according to claim 1 , wherein the predetermined operating state is a state in which variations in air-fuel ratio among the cylinders have occurred.

4. The state detection system for an internal combustion engine according to claim 1 , wherein
the road surface state variable indicates whether a road surface on which the vehicle is traveling is a paved road or an unpaved road, and
the storage device is configured to store, as the plurality of types of mapping data, mapping data for paved roads and mapping data for unpaved roads.

5. The state detection system for an internal combustion engine according to claim 1 , wherein the execution device is configured to, when the determination process determines that the internal combustion engine is in the predetermined operating state, perform a response process that operates hardware to respond to the predetermined operating state.

6. The state detection system for an internal combustion engine according to claim 1 , wherein
the determination process includes an output value calculation process that calculates the combustion state variable,
the combustion state variable is the output value of the detection mapping that takes, as inputs, the values of the rotation waveform variables obtained in the obtainment process,
the execution device includes a first execution device mounted on the vehicle and a second execution device mounted on an apparatus that is separate from the vehicle,
the first execution device is configured to perform
the obtainment process, and
a vehicle-side reception process that receives a signal based on a calculation result of the output value calculation process, and

the second execution device is configured to perform
the selection process,
the output value calculation process, and
an external transmission process that transmits to the vehicle the signal based on the calculation result of the output value calculation process.

7. A data analysis device comprising:
a second execution device; and
a storage device according, wherein
a first execution device, the second execution device, and the storage device configure a state detection system for an internal combustion engine, the state detection system being configured to be used for the internal combustion engine mounted on a vehicle to detect a predetermined operating state of the internal combustion engine that is accompanied by variations in combustion state among cylinders,
the storage device is configured to store a plurality of types of mapping data as mapping data defining a detection mapping, wherein
the plurality of types of mapping data is classified according to a state of a road surface on which the vehicle travels,
the detection mapping takes, as inputs, rotation waveform variables to output a combustion state variable,
the detection mapping is a mapping that is learned by machine learning,
the rotation waveform variables include information on a difference between cylinders in rotational speed of a crankshaft of the internal combustion engine during periods in which the respective cylinders generate combustion torque, and
the combustion state variable relates to a level of variations in combustion state among the cylinders,

the first execution device and the second execution device are configured to perform an obtainment process, a selection process, and a determination process, wherein
the obtainment process obtains values of the rotation waveform variables based on an output of a sensor that detects rotational behavior of the crankshaft, and obtains a value of a road surface state variable based on an output of a sensor that detects a state of the road surface,
the road surface state variable relates to a state of the road surface,
the selection process selects, as the detection mapping, the mapping data that is associated with the road surface state variable obtained in the obtainment process from the plurality of types of mapping data stored in the storage device, and
the determination process determines whether the internal combustion engine is in the predetermined operating state based on an output value of the detection mapping that is selected in the selection process and takes, as inputs, the values of the rotation waveform variables obtained in the obtainment process,

the determination process includes an output value calculation process that calculates the combustion state variable,
the combustion state variable is the output value of the detection mapping that takes, as inputs, the values of the rotation waveform variables obtained in the obtainment process,
the first execution device is mounted on the vehicle and the second execution device is mounted on an apparatus that is separate from the vehicle,
the first execution device is configured to perform
the obtainment process, and
a vehicle-side reception process that receives a signal based on a calculation result of the output value calculation process, and

the second execution device is configured to perform
the selection process,
the output value calculation process, and
an external transmission process that transmits to the vehicle the signal based on the calculation result of the output value calculation process.

8. A vehicle comprising:
a first execution device, wherein
the first execution device, a second execution

Assignees

• Toyota Motor Co Ltd

Inventors

• Hashimoto Yosuke
• Katayama Akihiro
• Oshiro Yuta
• Sugie Kazuki
• Oka Naoya

Classifications

• F02D35/02 Primary

  on interior conditions · CPC title

• F02B77/086

  Sensor arrangements in the exhaust, e.g. for temperature, misfire, air/fuel ratio, oxygen sensors · CPC title

• F02D41/22

  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 title

• F02D41/2438

  Active learning methods · CPC title

• F02D2200/1015

  Engines misfires · CPC title