EP0404069A1
Expired / Lapsed
EP
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Method and apparatus for detecting deterioration of sucked air flow quantitydetecting device of engine
Assignee: Hitachi Unisia Automotive Ltd
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Filing: 1990-06-19
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Granted: —
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Expires: 2010-06-19
Abstract
Abstract Sucked air flow quantities are preliminarily alloted and stored for respective areas of predetermined ranges of the driving state of an engine, and every time a new sucked air flow quantity is detected, the stored value is renewed based on the stored value and the newly detected value. In the method and apparatus for detecting deterioration of a sucked air flow quantity-detecting device of an engine according to the present invention, the engine driving state is detected and the stored value of the sucked air flow quantity in the corresponding area is retrieved, the retrieved stored value is compared with the sucked air flow quantity actually detected by the detecting device, and deterioration is judged when the difference is larger than a predetermined value.
Inventors
- 👤 Naoki Tomisawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 03:39
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/187; F02D41/22; F02D41/222; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2474; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
A method for detecting deterioration of a sucked air flow quantity-detecting device of an engine, which comprises the step of detecting the driving state of the engine, the step of retrieving a sucked air flow quantity from rewritable store means in which sucked air flow quantities are stored for respective areas of predetermined ranges of the driving state of the engine, based on the engine driving state detected at the engine-driving state-detecting step, the step of comparing the detected value of the sucked air flow quantity detected by the sucked air flow quantity-detecting device with the retrieved value of the stored sucked air flow quantity and judging unexpected deterioration of the sucked air flow quantity-detecting device when the difference is larger than a predetermined value, and the step of renewing the stored value of each area of the engine driving state based on the stored value of the sucked air flow quantity and the newly detected value.
Claim 2
Independent Claim
157 words
A method for detecting deterioration of a sucked air flow quantity-detecting device of an engine, which comprises the step of detecting the driving state of the engine, the step of retrieving a sucked air flow quantity from rewritable store means in which sucked air flow quantities are stored for respective areas of predetermined ranges of the driving state of the engine, based on the engine driving state detected at the engine-driving state-detecting step, the step of comparing the detected value of the sucked air flow quantity detected by the sucked air flow quantity-detecting device with the retrieved value of the stored sucked air flow quantity and judging unexpected deterioration of the sucked air flow quantity-detecting device when the difference is larger than a predetermined value, and the step of renewing the stored value of each area of the engine driving state based on the stored value of the sucked air flow quantity and the newly detected value.
Claim 3
Independent Claim
162 words
An apparatus for detecting deterioration of a sucked air flow quantity-detecting device of an engine, which comprises engine driving state-detecting means for detecting the driving state of the engine, rewritable store means in which sucked air flow quantities are stored for respective areas of predetermined ranges of the driving state of the engine, retrieving means for retrieving a sucked air flow quantity from the store means, based on the engine driving state detected by the engine driving state-detecting means, comparing and judging means for comparing a sucked air flow quantity detected by the sucked air flow quantity-detecting device with the stored value of the sucked air flow quantity retrieved by the retrieving means and judging unexpected deterioration when the difference is larger than a predetermined value, and renewing means for renewing the stored value of the memory means for each area of the engine driving state based on the stored value of the sucked air flow quantity and the newly detected value.
Claim 4
Independent Claim
162 words
An apparatus for detecting deterioration of a sucked air flow quantity-detecting device of an engine, which comprises engine driving state-detecting means for detecting the driving state of the engine, rewritable store means in which sucked air flow quantities are stored for respective areas of predetermined ranges of the driving state of the engine, retrieving means for retrieving a sucked air flow quantity from the store means, based on the engine driving state detected by the engine driving state-detecting means, comparing and judging means for comparing a sucked air flow quantity detected by the sucked air flow quantity-detecting device with the stored value of the sucked air flow quantity retrieved by the retrieving means and judging unexpected deterioration when the difference is larger than a predetermined value, and renewing means for renewing the stored value of the memory means for each area of the engine driving state based on the stored value of the sucked air flow quantity and the newly detected value.
Claim 5
Dependent Claim
45 words
An apparatus for detecting deterioration of a sucked air flow quantity-detecting device of an engine according to claim 2, wherein the engine driving state-detecting means detects the engine revolution speed and the opening degree of a throttle valve as parameters of the engine driving state.
Claim 6
Dependent Claim
84 words
An apparatus for detecting deterioration of a sucked air flow quantity-detecting device of an engine according to claim 2, wherein the renewing means renews the stored value Qo based on the detected value Q of the sucked air flow quantity according to the following equation: Qo ← Qo + (Q - Qo)/M wherein Qo of the right side is the precedent stored value, Qo of the left side is the renewed stored value, Q represents the detected value, and M is a weighting constant.
References Cited (Backward Citations)
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