US5282449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for engine control
Assignee: Hitachi Ltd
•
Filing: 1992-03-06
•
Granted: 1994-02-01
•
Expires: 2012-03-06
Abstract
Abstract To ensure a high-precision simultaneous control of the enginegenerated torque, air fuel ratio of the automobile engine and related factor, the present invention calculates the target air mass flow rate as the air mass flow rate at the inlet port which achieves the target torque, estimates the air flow condition inside the intake manifold, supplies the result to the fuel injection control system and the throttle control system, and determines the fuel injection pulse width which achieves the target air fuel ratio according to the estimated air mass flow rate at the inlet port for the fuel injection control system, while determining the throttle angle which achieves the target torque according to the estimated condition and the target air mass flow rate for the throttle control system.
Inventors
- 👤 Shinsuke Takahashi
- 👤 Teruji Sekozawa
- 👤 Makoto Shioya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:21
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D41/18; F02D41/182; F02D43/00; F02D2041/1433
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
108 words
An engine control method, comprising the steps of: detecting operating conditions of the engine, including air mass flow rate; calculating a value of target torque based upon the detected operating conditions of the engine; estimating a value of actual air flow status inside the intake manifold using an air flow model based upon at least one of said detected operating conditions of the engine related to air flow; calculating a throttle angle which achieves the calculated value of target torque, based on the calculated value of target torque and said estimated value of actual air flow status; and controlling the engine throttle based upon the calculated throttle angle.
Claim 2
Dependent Claim
108 words
An engine control method, comprising the steps of: detecting operating conditions of the engine, including air mass flow rate; calculating a value of target torque based upon the detected operating conditions of the engine; estimating a value of actual air flow status inside the intake manifold using an air flow model based upon at least one of said detected operating conditions of the engine related to air flow; calculating a throttle angle which achieves the calculated value of target torque, based on the calculated value of target torque and said estimated value of actual air flow status; and controlling the engine throttle based upon the calculated throttle angle.
Claim 3
Dependent Claim
38 words
An engine control method according to claim 1, wherein said actual air flow status comprises at least one of air mass flow rate at the throttle, air mass flow rate at the inlet port and intake manifold pressure.
Claim 4
Dependent Claim
83 words
An engine control method according to claim 2, further comprising the steps of: calculating a target air mass flow rate at the inlet port by use of the calculated target torque, on the basis of a formula defined in advance for the target torque and the air mass flow rate at the inlet port; and calculating a throttle angle which achieves the target torque from the said calculated target air mass flow rate at the inlet port and said estimated air flow status.
Claim 5
Dependent Claim
69 words
An engine control method according to claim 3, further comprising the steps of: linearizing around the current operating conditions of the engine an air flow model representing an air flow in the intake manifold; and calculating the throttle angle which achieves the target torque by use of the linearized model, the estimated value of actual air flow status, and the target air mass flow rate in the inlet port.
Claim 6
Dependent Claim
47 words
An engine control method according to claim 2, further comprising the steps of: detecting the engine torque; and calculating an effective throttle angle by correcting the calculated throttle angle by a correction coefficient which is obtained from a deviation between the detected torque and said target torque.
Claim 7
Dependent Claim
38 words
An engine control method according to claim 1, further comprising: a step of determining a fuel injection which achieves a target air fuel ratio according to a dynamic model representing a fuel transmission characteristics inside said intake manifold.
Claim 8
Dependent Claim
41 words
An engine control method according to claim 2, further comprising: a step of calculating said throttle angle, using a dynamic model which represents an air transmission characteristic inside the intake manifold, linearized in the neighborhood of the current engine operating conditions.
Claim 9
Dependent Claim
38 words
An engine control method according to claim 1, further comprising: a step of determining a fuel injection which achieves a target air fuel ratio according to a dynamic model representing a fuel transmission characteristics inside said intake manifold.
Claim 10
Dependent Claim
41 words
An engine control method according to claim 1, further comprising: a step of calculating said throttle angle, using a dynamic model which represents an air transmission characteristic inside and intake manifold, linearized in the neighborhood of the current engine operating conditions.
Claim 11
Dependent Claim
101 words
An engine control method, comprising the steps of: detecting operating conditions of the engine including intake manifold pressure; calculating a value of target torque based upon the detected operating conditions of the engine; estimating a value of actual air flow status inside the intake manifold using an air flow model based at least upon one of said detected operating conditions of the engine related to air flow; calculating a throttle angle which achieves the target torque, based on detected operating conditions and said estimated value of actual air flow status; and controlling the engine throttle based upon the calculated throttle angle.
Claim 12
Dependent Claim
101 words
An engine control method, comprising the steps of: detecting operating conditions of the engine including intake manifold pressure; calculating a value of target torque based upon the detected operating conditions of the engine; estimating a value of actual air flow status inside the intake manifold using an air flow model based at least upon one of said detected operating conditions of the engine related to air flow; calculating a throttle angle which achieves the target torque, based on detected operating conditions and said estimated value of actual air flow status; and controlling the engine throttle based upon the calculated throttle angle.
Claim 13
Dependent Claim
33 words
An engine control method according to claim 10, wherein said actual air flow status comprises at least air mass flow rate at the throttle and air mass flow rate at the inlet port.
Claim 14
Dependent Claim
86 words
An engine control method according to claim 11, further comprising: a step of calculating a target air mass flow rate at the inlet port by use of the calculated target torque, on the basis of a formula defined in advance for the target torque and the air mass flow rate at the inlet port; and a step of calculating the throttle angle which achieves the target torque from said calculated target air mass flow rate at the inlet port and said estimated actual air flow status.
Claim 15
Dependent Claim
70 words
An engine control method according to claim 11, further comprising: a step of linearizing around the current operating conditions of the engine, an air flow model representing an air flow in the intake manifold; and a step of calculating the throttle angle which achieves the target torque by use of a linearized model, the estimated actual air flow status, and the target air mass flow rate at the inlet port.
Claim 16
Dependent Claim
50 words
An engine control method according to claim 11, further comprising: a step of detecting the engine torque; and a step of calculating the effective throttle angle by correcting the calculated throttle angle by a correction coefficient which is obtained from the deviation between said detected torque and the target torque.
Claim 17
Dependent Claim
38 words
An engine control method according to claim 10, further comprising: a step of determining a fuel injection which achieves a target air fuel ratio according to a dynamic model representing a fuel transmission characteristics inside said intake manifold.
Claim 18
Dependent Claim
40 words
An engine control method according to claim 10, further comprising: a step calculating said throttle angle, using a dynamic model which represents an air transmission characteristic inside the intake manifold, linearized in the neighborhood of the current engine operating conditions.
Claim 19
Dependent Claim
49 words
An engine control method according to claim 10, further comprising: a step of detecting the engine torque; and a step of calculating an effective throttle angle by multiplying the calculated throttle angle by a correction coefficient which is obtained from deviation between the detected torque and the target torque.
Claim 20
Dependent Claim
89 words
An engine control method, comprising the steps of: detecting operating conditions of the engine including intake manifold pressure; calculating a value of target torque based upon detected operating conditions of the engine; calculating a target air mass flow rate at the inlet port from the target torque; calculating a throttle angle which achieves the target torque, based on the intake manifold pressure detected in the detecting step and said target air mass flow rate at the inlet port; and controlling the engine throttle based upon the calculated throttle angle.
Claim 21
Dependent Claim
89 words
An engine control method, comprising the steps of: detecting operating conditions of the engine including intake manifold pressure; calculating a value of target torque based upon detected operating conditions of the engine; calculating a target air mass flow rate at the inlet port from the target torque; calculating a throttle angle which achieves the target torque, based on the intake manifold pressure detected in the detecting step and said target air mass flow rate at the inlet port; and controlling the engine throttle based upon the calculated throttle angle.
Claim 22
Dependent Claim
80 words
An engine control method according to claim 18, further comprising the steps of: estimating a value of actual air flow status inside the intake manifold using an air flow model based at least on a detected operating condition of the engine related to air flow; and calculating a throttle angle which achieves the target torque from detected operating conditions and the estimated value of actual air flow status and said calculated target air mass flow rate at the inlet port.
Claim 23
Dependent Claim
69 words
An engine control method according to claim 18, further comprising the steps of: linearizing around the current operating conditions of the engine an air flow model representing an air flow in the intake manifold; and calculating a throttle angle which achieves the target torque by use of the linearized model, the estimated value of actual air flow status and the target air mass flow rate in the inlet port.
Claim 24
Dependent Claim
38 words
An engine control method according to claim 18, further comprising: a step of determining a fuel injection which achieves a target air fuel ratio according to a dynamic model representing a fuel transmission characteristics inside the intake manifold.
Claim 25
Dependent Claim
61 words
An engine control method according to claim 18, further comprising: a step of obtaining by experiment a relation of correspondence between the engine conditions including the target air mass flow rate at the inlet port and the engine-generated torque; and a step of calculating the target air mass flow rate at the inlet port from the target torque using the relation.
Claim 26
Dependent Claim
43 words
An engine control method according to claim 18, further comprising: a step of calculating the said throttle angle, using the dynamic model which represents the fuel transmission characteristics inside the said intake manifold, linearized in the neighborhood of the current engine operating conditions.
Claim 27
Dependent Claim
111 words
An engine control system comprising: means for detecting operating conditions of the engine, including a condition related to air flow; means for calculating a value of target torque based upon detected operating conditions of the engine; means for estimating a value of actual air flow status inside the intake manifold using an air flow model based at least on one of the detected operating conditions of the engine related to air flow; means for calculating a throttle angle which achieves the calculated value of target torque, based at least on said estimated value of actual air flow status; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 28
Dependent Claim
111 words
An engine control system comprising: means for detecting operating conditions of the engine, including a condition related to air flow; means for calculating a value of target torque based upon detected operating conditions of the engine; means for estimating a value of actual air flow status inside the intake manifold using an air flow model based at least on one of the detected operating conditions of the engine related to air flow; means for calculating a throttle angle which achieves the calculated value of target torque, based at least on said estimated value of actual air flow status; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 29
Dependent Claim
123 words
An engine control system comprising: means for detecting operating conditions of the engine, including air mass flow rate; means for calculating a value of target torque based upon detected operating conditions of the engine; means for estimating a value of actual air flow status inside the intake manifold using an air flow model based at least upon one of said detected operating conditions of the engine related to air flow, said actual air flow status being different from said detected air mass flow rate; means for calculating a throttle angle which achieves the calculated value of target torque, based at least on said estimated value of actual air flow status; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 30
Dependent Claim
123 words
An engine control system comprising: means for detecting operating conditions of the engine, including air mass flow rate; means for calculating a value of target torque based upon detected operating conditions of the engine; means for estimating a value of actual air flow status inside the intake manifold using an air flow model based at least upon one of said detected operating conditions of the engine related to air flow, said actual air flow status being different from said detected air mass flow rate; means for calculating a throttle angle which achieves the calculated value of target torque, based at least on said estimated value of actual air flow status; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 31
Dependent Claim
118 words
An engine control system comprising: means for detecting operating conditions of the engine, including intake manifold pressure; means for calculating a value of target torque based upon detected operating conditions of the engine; means for estimating an actual air flow status inside the intake manifold using an air flow model based at least upon one of said detected operating conditions of the engine related to air flow, said actual air flow status being different from said detected intake manifold pressure; means for calculating a throttle angle which achieves said target torque from the detected operating conditions and the estimated value of actual air flow status; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 32
Dependent Claim
118 words
An engine control system comprising: means for detecting operating conditions of the engine, including intake manifold pressure; means for calculating a value of target torque based upon detected operating conditions of the engine; means for estimating an actual air flow status inside the intake manifold using an air flow model based at least upon one of said detected operating conditions of the engine related to air flow, said actual air flow status being different from said detected intake manifold pressure; means for calculating a throttle angle which achieves said target torque from the detected operating conditions and the estimated value of actual air flow status; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 33
Dependent Claim
92 words
An engine control system comprising: means for detecting operating conditions of the engine, including intake manifold pressure; means for calculating a value of target torque based upon detected operating conditions of the engine; means for calculating a target air mass flow rate at the inlet port from the target torque; means for calculating a throttle angle which achieves the target torque, based on the detected intake manifold pressure and said target air mass flow rate at the inlet port; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 34
Dependent Claim
92 words
An engine control system comprising: means for detecting operating conditions of the engine, including intake manifold pressure; means for calculating a value of target torque based upon detected operating conditions of the engine; means for calculating a target air mass flow rate at the inlet port from the target torque; means for calculating a throttle angle which achieves the target torque, based on the detected intake manifold pressure and said target air mass flow rate at the inlet port; and means for controlling the engine throttle based upon the calculated throttle angle.
Claim 35
Dependent Claim
116 words
An engine control method comprising: a step of detecting operating conditions of the engine, including a condition related to air flow; a step of calculating a target torque, based upon the detected operating conditions of the engine; a step of estimating a value of actual air flow status inside the intake manifold, through an air flow model using at least one of the detected operating conditions of the engine in connection with an air flow; a step of calculating a throttle angle which achieves the calculated target torque, based on the calculated target torque and said estimated value of actual air flow status; and a step of controlling the throttle based upon the calculated throttle angle.
Claim 36
Dependent Claim
116 words
An engine control method comprising: a step of detecting operating conditions of the engine, including a condition related to air flow; a step of calculating a target torque, based upon the detected operating conditions of the engine; a step of estimating a value of actual air flow status inside the intake manifold, through an air flow model using at least one of the detected operating conditions of the engine in connection with an air flow; a step of calculating a throttle angle which achieves the calculated target torque, based on the calculated target torque and said estimated value of actual air flow status; and a step of controlling the throttle based upon the calculated throttle angle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |