US4195598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining the injection time in externally ignited internal combustion engines
Assignee: Robert Bosch GmbH
•
Filing: 1978-08-01
•
Granted: 1980-04-01
•
Expires: 1998-08-01
Abstract
Abstract A method and an apparatus for the determination of the injection time in externally ignited internal combustion engines, which serve to provide the optimal injection time under given operating conditions, this injection time being derived on the basis of the rpm and the angle of the throttle valve wherein a basic injection time signal is derived from an rpm and a throttle valve angle signal and this signal is subsequently modified by means of a controlled nonlinear function generator to closely approximate an empirically ascertained optimal value for the injection time under given operating conditions, the basic injection time signal being formed in a divider circuit to provide an output signal which is fed to at least one nonlinearity function generator controllable in accordance with the throttle valve angle and the rpm.
Inventors
- 👤 Jurgen Anlauf
- 👤 Hans Schnurle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/36; F02D41/365
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A method of determining the injection time in externally ignited internal combustion engines including the steps of providing an rpm signal and a throttle valve angle signal, deriving a basic injection time signal on the basis of said rpm signal and said throttle valve angle signal, modifying said basic injection time signal by means of a controllable nonlinearity function generator containing an e-function to closely approximate an empirically derived optimal value for the injection time at given operating characteristics, maintaining the time constant of said function generator at a constant value and controlling the charging and/or discharging time of said function generator.
Claim 2
Independent Claim
102 words
A method of determining the injection time in externally ignited internal combustion engines including the steps of providing an rpm signal and a throttle valve angle signal, deriving a basic injection time signal on the basis of said rpm signal and said throttle valve angle signal, modifying said basic injection time signal by means of a controllable nonlinearity function generator containing an e-function to closely approximate an empirically derived optimal value for the injection time at given operating characteristics, maintaining the time constant of said function generator at a constant value and controlling the charging and/or discharging time of said function generator.
Claim 3
Dependent Claim
22 words
A method according to claim 1, including the step of controlling said nonlinearity function generator by means of a variable limiting-value voltage.
Claim 4
Dependent Claim
27 words
A method according to claim 2, wherein said limiting-value voltage of the e-function is increased at a constant rpm with an increase in the throttle valve angle.
Claim 5
Dependent Claim
28 words
A method according to claim 2, wherein the limiting-value of the e-function is lowered with a decrease in rpm and with an increase in the throttle valve angle.
Claim 6
Independent Claim
116 words
An apparatus for determining the injection time in externally ignited internal combustion engines comprising, in combination, means for producing an rpm signal, means for producing a throttle valve angle signal, means for deriving a basic injection time signal, a divider stage coupled to said rpm signal producing means and to said throttle valve angle signal producing means for deriving said rpm and said throttle valve angle signals and a controllable nonlinearity function generator having a predetermined, non-variable constant coupled to the outlet of said divider stage and means for modifying said basic injection time with said controllable non-linearity function generator to closely approximate an empirically derived optimal value for the injection time at given operating characteristics.
Claim 7
Independent Claim
116 words
An apparatus for determining the injection time in externally ignited internal combustion engines comprising, in combination, means for producing an rpm signal, means for producing a throttle valve angle signal, means for deriving a basic injection time signal, a divider stage coupled to said rpm signal producing means and to said throttle valve angle signal producing means for deriving said rpm and said throttle valve angle signals and a controllable nonlinearity function generator having a predetermined, non-variable constant coupled to the outlet of said divider stage and means for modifying said basic injection time with said controllable non-linearity function generator to closely approximate an empirically derived optimal value for the injection time at given operating characteristics.
Claim 8
Dependent Claim
19 words
An apparatus according to claim 5, including a voltage-time-converter coupled to the outlet of said controllable nonlinearity function generator.
Claim 9
Dependent Claim
28 words
An apparatus according to claim 5, including a final-value control stage coupled to said controllable nonlinearity function generator for controlling the limitingvalue voltage of the nonlinearity function generator.
Claim 10
Dependent Claim
20 words
An apparatus according to claim 7, including a performance graph damping stage connected at least to said final-value control stage.
Claim 11
Dependent Claim
29 words
An apparatus according to claim 8, including means for feeding said rpm and/or throttle valve angle signals to said performance graph damping stage and/or to said final-value control stage.
Claim 12
Dependent Claim
15 words
An apparatus according to claim 5 including an anti-bounce circuit coupled to said divider stage.
References Cited (Backward Citations)
US3483364A
Cited
US3724430A
Cited
US3796197A
Cited
US3750632A
Cited
DE2426976A1
Cited
US4034722A
Cited
US4048964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |