# US 2025/0092840 A1 · Pre-ignition determining apparatus for internal combustion engine

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- Number: US 2025/0092840 A1
- Document ID: US20250092840A1
- Status: Published application
- Kind: A1
- Application number: 18/811,893
- Filed: 2024-08-22
- Published: 2025-03-20
- Earliest claimed: 2023-09-19
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Norihito HANAI; Masanori TOYA
- Web page: https://patentgrep.com/patent/US20250092840A1

## CPC

- F02D 41/22: 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)}
- F02B 43/00: Engines characterised by operating on gaseous fuels; Plants including such engines (engines characterised by the gas-air charge being ignited by compression ignition of an additional fuel F02B7/06; engines convertible from gas to other fuel consumption F02B69/04)
- F02D 41/0027: {the fuel being gaseous (non-electrical control F02D19/02)}
- F02D 35/027: {using knock sensors}
- F02D 2250/14: Timing of measurement, e.g. synchronisation of measurements to the engine cycle
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

A pre-ignition determining apparatus for an internal combustion engine using hydrogen as fuel is configured to determine an occurrence of pre-ignition based on an output value of a vibration sensor provided in the internal combustion engine. The pre-ignition determining apparatus includes processing circuitry that is configured to execute an accumulation process of calculating an accumulated value of the output value within a prescribed period prior to an ignition timing of an air-fuel mixture, and a determination process of determining the occurrence of pre-ignition based on the accumulated value.

## Claims

### Claim 1

An apparatus configured to determine an occurrence of pre-ignition based on an output value of a vibration sensor provided in an internal combustion engine using hydrogen as fuel, the apparatus comprising processing circuitry, wherein the processing circuitry is configured to execute:
an accumulation process of calculating an accumulated value of the output value within a prescribed period prior to an ignition timing of an air-fuel mixture; and
a determination process of determining the occurrence of pre-ignition based on the accumulated value.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein the determination process is a process of determining the occurrence of pre-ignition by comparing the accumulated value with a prescribed threshold.

### Claim 3 (depends on 2)

The apparatus according to claim 2, wherein the threshold is set based on an engine operating state.

### Claim 4 (depends on 1)

The apparatus according to claim 1, wherein
the accumulated value calculated when pre-ignition is not occurring is a normal value, and
the determination process is a process of determining the occurrence of pre-ignition by comparing a ratio of the accumulated value calculated in the accumulation process to the normal value with a prescribed threshold.

### Claim 5 (depends on 4)

The apparatus according to claim 4, wherein the normal value is set based on an engine operating state.