18331257. INTERNAL COMBUSTION ENGINE ABNORMALITY DIAGNOSIS DEVICE simplified abstract (TOYOTA JIDOSHA KABUSHIKI KAISHA)

INTERNAL COMBUSTION ENGINE ABNORMALITY DIAGNOSIS DEVICE

Organization Name

TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor(s)

Tomoyuki Tsuji of Nagakute-shi (JP)

Naoya Okubo of Chiryu-shi (JP)

Tomonori Satoh of Miyoshi-shi (JP)

INTERNAL COMBUSTION ENGINE ABNORMALITY DIAGNOSIS DEVICE - A simplified explanation of the abstract

This abstract first appeared for US patent application 18331257 titled 'INTERNAL COMBUSTION ENGINE ABNORMALITY DIAGNOSIS DEVICE

Simplified Explanation

The patent application describes a diagnosis device for an internal combustion engine with a supercharger, a blow-by gas passage, a PCV pressure sensor, and a crankshaft. The device detects abnormalities in the blow-by gas passage by analyzing fluctuations in intake air amount and PCV pressure.

• The device specifies a specific period for analyzing fluctuations in intake air amount.
• It calculates the amount of fluctuations in PCV pressure during the specific period.
• It determines the presence of an abnormality in the blow-by gas passage based on the amount of fluctuations in PCV pressure.
• The device adjusts the determination air amount based on the rotational speed of the crankshaft.

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1. 1. 1. Potential Applications

• Automotive industry for diagnosing engine issues.
• Maintenance and repair services for internal combustion engines.

1. 1. 1. Problems Solved

• Early detection of abnormalities in the blow-by gas passage.
• Improved engine performance and efficiency.
• Preventing potential damage to the engine components.

1. 1. 1. Benefits

• Increased reliability of internal combustion engines.
• Cost-effective maintenance through early detection of issues.
• Enhanced overall performance and longevity of the engine.

Original Abstract Submitted

A diagnosis device is intended for an internal combustion engine including a supercharger, a blow-by gas passage that communicates between a portion of an intake passage and a crankcase, a PCV pressure sensor that detects a PCV pressure in the blow-by gas passage, and a crankshaft. The device executes specifying a specific period for which the amount of fluctuations in the intake air amount per unit time is a prescribed value or more on condition that the intake air amount is a determination air amount or more, calculating the amount of fluctuations in the PCV pressure during the specific period, and determining, based on the amount of fluctuations in the PCV pressure, the presence of an abnormality in the blow-by gas passage. The device sets the determination air amount to a smaller value when the rotational speed of the crankshaft is high than when the rotational speed is low.