Patent US3008085A successfully refreshed from Google Patents.
Patent US5875762A successfully refreshed from Google Patents.
US5875762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine controller
Assignee: Mitsubishi Electric Corp
•
Filing: 1998-02-03
•
Granted: 1999-03-02
•
Expires: 2018-02-03
Abstract
Abstract An engine controller includes various sensors for detecting a degree of throttle opening θ and a degree of accelerator opening α and a control unit 5 for determining the control amount θc of a throttle actuator 1 from operating states, the control unit includes an A/D converter 70 for A/D converting respective degrees of opening at a predetermined resolving power, means 71 for calculating a target degree of throttle opening θ1 at a resolving power higher than the predetermined resolving power, means 72 for calculating a target degree of throttle opening θ2 at the predetermined resolving power in accordance with the target degree of throttle opening θ1 and means 73 for calculating a control amount in accordance with the target degree of throttle opening θ2, the target degree of throttle opening θ2 includes two points which are determined by the predetermined resolving power and control amount calculation means repeatedly controls the throttle actuator at a predetermined cycle using the target degree of throttle opening θ2 as the control amount under predetermined operating conditions. With this arrangement, the engine controller having a high speed and a pinpoint accuracy can be provided at a less expensive cost without using an expensive A/D converter.
Inventors
- 👤 Kenichi Tsuchiya
- 👤 Shiro Yonezawa
- 👤 Hirofumi Ohuchi
- 👤 Tadashi Tubakiji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:40
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/28; F02D11/00; F02D11/06; F02D11/10; F02D11/106; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0404
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
228 words
An engine controller, comprising: a throttle actuator for electrically regulating a degree of throttle opening for determining the amount of intake air of an engine; various sensors for detecting the operating states of the engine including the degree of throttle opening and a degree of accelerator opening; and a throttle control unit for determining the control amount of said throttle actuator based on the operating states, wherein, said throttle control unit, comprising: an A/D converter for converting the degree of throttle opening and the degree of accelerator opening into digital signals at a predetermined resolving power; first calculation means for calculating a first target degree of throttle opening at a first resolving power higher than the predetermined resolving power; second calculation means for calculating a second target degree of throttle opening at a second resolving power equal to the predetermined resolving power in accordance with the first target degree of throttle opening; and control amount calculation means for calculating the control amount in accordance with the operating states and the first and second target degrees of throttle opening, the second target degree of throttle opening includes two points determined at the second resolving power; and said control amount calculation means repeatedly controls said throttle actuator at a predetermined cycle using the second target degree of throttle opening as the control amount when the operating states satisfy predetermined conditions.
Claim 2
Dependent Claim
228 words
An engine controller, comprising: a throttle actuator for electrically regulating a degree of throttle opening for determining the amount of intake air of an engine; various sensors for detecting the operating states of the engine including the degree of throttle opening and a degree of accelerator opening; and a throttle control unit for determining the control amount of said throttle actuator based on the operating states, wherein, said throttle control unit, comprising: an A/D converter for converting the degree of throttle opening and the degree of accelerator opening into digital signals at a predetermined resolving power; first calculation means for calculating a first target degree of throttle opening at a first resolving power higher than the predetermined resolving power; second calculation means for calculating a second target degree of throttle opening at a second resolving power equal to the predetermined resolving power in accordance with the first target degree of throttle opening; and control amount calculation means for calculating the control amount in accordance with the operating states and the first and second target degrees of throttle opening, the second target degree of throttle opening includes two points determined at the second resolving power; and said control amount calculation means repeatedly controls said throttle actuator at a predetermined cycle using the second target degree of throttle opening as the control amount when the operating states satisfy predetermined conditions.
Claim 3
Dependent Claim
62 words
An engine controller according to claim 1, wherein when the first target degree of throttle opening is not equal to the second target degree of throttle opening, said control amount calculation means repeats the control amount at the two points which are located across the first target degree of throttle opening and determined at the second resolving power at a predetermined cycle.
Claim 4
Dependent Claim
61 words
An engine controller according to claim 1, wherein when the first target degree of throttle opening is equal to the second target degree of throttle opening, said control amount calculation means repeats the control amount at the two points which are located across the first target degree of throttle opening and determined by the second resolving power at a predetermined cycle.
Claim 5
Dependent Claim
52 words
An engine controller according to claim 1, wherein when the first target degree of throttle opening is equal to the second target degree of throttle opening, said control amount calculation means prohibits the repetition of the control and causes the control amount to coincide with the first target degree of throttle opening.
Claim 6
Dependent Claim
39 words
An engine controller according to claim 1, wherein the predetermined cycle is set longer than the response time of said throttle actuator as well as shorter than one half the delay time of the intake air of the engine.
Claim 7
Dependent Claim
68 words
An engine controller according to claim 2, wherein the ratio at which the control amount is repeated at the two points which are located across the first target degree of throttle opening in accordance with the second target degree of throttle opening is set by the function of the remainder obtained by subtracting the second target degree of throttle opening from the first target degree of throttle opening.
Claim 8
Dependent Claim
43 words
An engine controller according to claim 3, wherein the ratio at which the control amount is repeated at the two points across the first target degree of throttle opening in accordance with the second target degree of throttle opening is set to 1:1.
Claim 9
Dependent Claim
134 words
An engine controller according to claim 1, wherein: said throttle control unit includes operating state discrimination means for discriminating an ordinary operating state and predetermined operating states in accordance with the above operating states; said first calculation means prohibits the calculation of the first target degree of throttle opening when the ordinary operating state is discriminated and calculates the first target degree of throttle opening in accordance with the degree of accelerator opening when the predetermined operating states are discriminated; and said second calculation means calculates the second target degree of throttle opening in accordance with the degree of accelerator opening when the ordinary operating state is discriminated and calculates the second target degree of throttle opening in accordance with the first target degree of throttle opening when the predetermined operating states are discriminated.
Claim 10
Dependent Claim
43 words
An engine controller according to claim 8, wherein said various sensors include idle detection means and said operating state discrimination means discriminates an idle operating state based on a detection signal from said idle detection means as one of the predetermined operating states.
Claim 11
Dependent Claim
44 words
An engine controller according to claim 8, wherein said various sensors include wheel slip detection means and said operating state discrimination means discriminates a wheel slip state based on a detection signal from said idle detection means as one of the predetermined operating states.
Claim 12
Dependent Claim
46 words
An engine controller according to claim 8, wherein said various sensors include constant speed travel detection means and said operating state discrimination means discriminates a constant speed traveling state based on a detection signal from said idle detection means as one of the predetermined operating states.
Claim 13
Dependent Claim
45 words
An engine controller according to claim 8, wherein said various sensors include first idle detection means and said operating state discrimination means discriminates a first idle operating state based on a detection signal from said idle detection means as one of the predetermined operating states.
References Cited (Backward Citations)
US5447134A
Cited
JPH06101550A
Cited
US5492095A
Cited
US5560335A
Cited
US5415144A
Cited
US5566656A
Cited
US5746178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |