US4892072A
Expired / Lapsed
US
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System for measuring amount of air introduced into combustion chamber of internal combustion engine with avoiding influence of temperature dependent air density variation and pulsatile air flow
Assignee: Nissan Motor Co Ltd
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Filing: 1988-05-19
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Granted: 1990-01-09
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Expires: 2008-05-19
Abstract
Abstract A system for measuring intake air amount to be introduced into an engine cylinder employs a throttle angle sensor as a basic intake air flow amount indicative factor. Basic intake air flow amount is derived on the basis of a throttle valve angular position and an engine speed. The basic intake air flow amount is corrected with taking delay factor to introduce the intake air past the throttle valve into the engine cylinder, and a temperature dependent factor compensating variation of air density depending upon the temperature condition.
Inventors
- 👤 Hiromichi Miwa
- 👤 Hatsuo Nagaishi
- 👤 Ichirou Kishiki
- 👤 Hirokimi Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:55
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/30; F02D41/32; G; G01; G01F; G01F1/00; G01F1/05; G01F1/20; G01F1/22; G01F1/24; G01F15/00; G01F15/02; G01F15/04; G01F15/043; G01F15/046
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
160 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for driving a basic engine load indicative data on the basis of a path area of an air induction passage of said internal combustion engine and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for deriving a delay factor for introducing intake air into anengine cylinder on the basis of said first and secondsignal values, and a time dependent firs correction value for correcting said basic engine load indicative data on the basis of said delay factor; and a fourth means for modifying said second signal value on the basis of said first correction value and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
Claim 2
Independent Claim
160 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for driving a basic engine load indicative data on the basis of a path area of an air induction passage of said internal combustion engine and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for deriving a delay factor for introducing intake air into anengine cylinder on the basis of said first and secondsignal values, and a time dependent firs correction value for correcting said basic engine load indicative data on the basis of said delay factor; and a fourth means for modifying said second signal value on the basis of said first correction value and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
Claim 3
Dependent Claim
45 words
An intake air amount detecting system as set forth in claim 1, wherein said second means includes a throttle angle sensor for monitoring a throttle angle position to produce a throttle angle signal as a data representative of path area of said intake air passage.
Claim 4
Dependent Claim
45 words
An intake air amount detecting system as set forth in claim 1, wherein said fourth means derives said delay factor which is a coefficient depending upon lag time of introduction into said engine cylinder from a position of said throttle valve to said engine cylinder.
Claim 5
Dependent Claim
92 words
An intake air amount detecting system as set forth in claim 1, which further comprises: a fifth means for monitoring a preselected engine driving parameter affecting density of intake air to produce a third signal; a sixth means for deriving an air density dependent second correction value for correcting said basic engine load indicative data on the basis of said third signal, and said fourth means further correcting said basic engine load indicative data as represented by said second signal and modified by said first correction value, by said second correction value.
Claim 6
Dependent Claim
37 words
An intake air amount detecting system as set forth in claim 1, wherein said fifth means includes an intake air temperature sensor for producing an intake air temperature indicative signal as said intake air density affecting parameter.
Claim 7
Dependent Claim
37 words
An intake air amount detecting system as set forth in claim 1, wherein said fifth means includes an engine coolant temperature sensor for producing an engine coolant temperature indicative signal as said intake air density affecting parameter.
Claim 8
Dependent Claim
31 words
An intake air amount detecting system as set forth in claim 4, wherein said sixth means derives said second correction value on the basis of said intake air temperature indicative signal.
Claim 9
Dependent Claim
65 words
An intake air amount detecting system as set froth in claim 7, wherein said fifth means further included an engine coolant temperature sensor for producing an engine coolant temperature indicative signal as the another intake air density affecting parameter, and said sixth means modifies said second correction value derived based on said intake temperature indicative signal based on said engine coolant temperature indicative signal value.
Claim 10
Dependent Claim
33 words
An intake air amount detecting system as set forth in claim 7, wherein said sixth means modifies said second correction value with a value derived on the basis of said first signal value.
Claim 11
Dependent Claim
33 words
An intake air amount detecting system as set forth in claim 7, wherein said sixth means modifies said second correction value with a value derived on the basis of said second signal value.
Claim 12
Dependent Claim
41 words
An intake air amount detecting system as set forth in claim 8, wherein said sixth means varies magnitude of modification of said second correction value on the basis of said engine coolant indicative signal value, depending upon said first signal value.
Claim 13
Dependent Claim
43 words
An intake air amount detecting system as set forth in claim 8, wherein said sixth means varies magnitude of modification of said second correction value derived on the basis of said engine coolant temperature indicative signal value depending upon said second signal value.
Claim 14
Dependent Claim
44 words
An intake air amount detecting system as set forth in claim 12, wherein said sixth means further varies magnitude of modification of said second correction value derived on the basis of said engine coolant temperature indicative signal value depending upon said second signal value.
Claim 15
Dependent Claim
33 words
An intake air amount detecting system as set forth in claim 4, wherein said intake air temperature sensor is disposed within said intake air passage at a position upstream of said throttle valve.
Claim 16
Independent Claim
208 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for deriving a basic engine load indicative data on the basis of an air induction passage of said internal combustion engine and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for monitoring a preselected engine driving parameter affecting density of intake air to produce a third signal; a fourth means for deriving a delay factor for introducing intake air into an engine cylinder on the basis of said first and second signal values, and deriving a time dependent first correction value for correcting said basic engine load indicative data on the basis of said delay factor; a fifth means for deriving an air density dependent second correction value for correcting said basic engine load indicative data on the basis of said third signal; and a sixth means for modifying said second signal value on the basis of said first and second correction values and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
Claim 17
Independent Claim
208 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for deriving a basic engine load indicative data on the basis of an air induction passage of said internal combustion engine and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for monitoring a preselected engine driving parameter affecting density of intake air to produce a third signal; a fourth means for deriving a delay factor for introducing intake air into an engine cylinder on the basis of said first and second signal values, and deriving a time dependent first correction value for correcting said basic engine load indicative data on the basis of said delay factor; a fifth means for deriving an air density dependent second correction value for correcting said basic engine load indicative data on the basis of said third signal; and a sixth means for modifying said second signal value on the basis of said first and second correction values and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
Claim 18
Dependent Claim
45 words
An intake air amount detecting system as set forth in claim 15, wherein said second means includes a throttle angle sensor for monitoring a throttle angle position to produce a throttle angle signal as a data representative of path area of said intake air passage.
Claim 19
Dependent Claim
45 words
An intake air amount detecting system as set forth in claim 15, wherein said fourth means derives said delay factor which is a coefficient depending upon lag time of introduction into said engine cylinder from a position of said throttle valve to said engine cylinder.
Claim 20
Dependent Claim
37 words
An intake air amount detecting system as set forth in claim 15, wherein said third means includes an intake air temperature sensor for producing an intake air temperature indicative signal as said intake air density affecting parameter.
Claim 21
Dependent Claim
37 words
An intake air amount detecting system as set forth in claim 15, wherein said third means includes an engine coolant temperature sensor for producing an engine coolant temperature indicative signal as said intake air density affecting parameter.
Claim 22
Dependent Claim
31 words
An intake air amount detecting system as set forth in claim 19, wherein said fifth means derives said second correction value on the basis of said intake air temperature indicative signal.
Claim 23
Dependent Claim
65 words
An intake air amount detecting system as set froth in claim 20, wherein said third means further included an engine coolant temperature sensor for producing an engine coolant temperature indicative signal as the another intake air density affecting parameter, and said fifth means modifies said second correction value derived based on said intake temperature indicative signal based on said engine coolant temperature indicative signal value.
Claim 24
Dependent Claim
33 words
An intake air amount detecting system as set forth in claim 20, wherein said fifth means modifies said second correction value with a value derived on the basis of said first signal value.
Claim 25
Dependent Claim
33 words
An intake air amount detecting system as set forth in claim 20, wherein said fifth means modifies said second correction value with a value derived on the basis of said second signal value.
Claim 26
Dependent Claim
41 words
An intake air amount detecting system as set forth in claim 16, wherein said fifth means varies magnitude of modification of said second correction value on the basis of said engine coolant indicative signal value, depending upon said first signal value.
Claim 27
Dependent Claim
43 words
An intake air amount detecting system as set forth in claim 16, wherein said fifth means varies magnitude of modification of said second correction value derived on the basis of said engine coolant temperature indicative signal value depending upon said second signal value.
Claim 28
Dependent Claim
44 words
An intake air amount detecting system as set forth in claim 25, wherein said fifth means further varies magnitude of modification of said second correction value derived on the basis of said engine coolant temperature indicative signal value depending upon said second signal value.
Claim 29
Dependent Claim
33 words
An intake air amount detecting system as set forth in claim 18, wherein said intake air temperature sensor is disposed within said intake air passage at a position upstream of said throttle valve.
Claim 30
Independent Claim
157 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for monitoring a throttle valve open angle for deriving a basic engine load indicative data on the basis thereof and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for deriving a delay factor for introducing intake air into an engine cylinder on the basis of said first and second signal values, and deriving a time dependent first correction value for correcting said basic engine load indicative data on the basis of said delay factor; and a fourth means for modifying said second signal value on the basis of said first correction value and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
Claim 31
Independent Claim
157 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for monitoring a throttle valve open angle for deriving a basic engine load indicative data on the basis thereof and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for deriving a delay factor for introducing intake air into an engine cylinder on the basis of said first and second signal values, and deriving a time dependent first correction value for correcting said basic engine load indicative data on the basis of said delay factor; and a fourth means for modifying said second signal value on the basis of said first correction value and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
Claim 32
Independent Claim
206 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for monitoring a throttle valve open angle for deriving a basic engine load indicative data on the basis thereof and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for monitoring a preselected engine driving parameter affecting density of intake air to produce a third signal; a fourth means for deriving a delay factor for introducing intake air into an engine cylinder on the basis of said first and second signal values, and deriving a time dependent first correction value for correcting said basic engine load indicative data on the basis of said delay factor; a fifth means for deriving an air density dependent second correction value for correcting said basic engine load indicative data on the basis of said third signal; and a sixth means for modifying said second signal value on the basis of said first and second correction values and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
Claim 33
Independent Claim
206 words
A system for detecting intake air flow amount in an internal combustion engine, comprising: a first means for monitoring an engine revolution speed to produce an engine speed indicative first signal; a second means for monitoring a throttle valve open angle for deriving a basic engine load indicative data on the basis thereof and said first signal value, said second means producing a second signal indicative of said basic engine load; a third means for monitoring a preselected engine driving parameter affecting density of intake air to produce a third signal; a fourth means for deriving a delay factor for introducing intake air into an engine cylinder on the basis of said first and second signal values, and deriving a time dependent first correction value for correcting said basic engine load indicative data on the basis of said delay factor; a fifth means for deriving an air density dependent second correction value for correcting said basic engine load indicative data on the basis of said third signal; and a sixth means for modifying said second signal value on the basis of said first and second correction values and outputting a modified second signal as said intake air amount indicative signal indicative of the intake air amount.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |