Electronic control unit for controlling an electronic injector fuel delivery system and method of controlling an electronic injector fuel delivery system
First Claim
1. A method for controlling an electronic fuel delivery system, comprising:
- a) running an engine by at least injecting fuel into said engine in fuel pulse width amounts for specific pairs of engine operating parameters corresponding to fuel pulse widths in an initial fuel map, said initial fuel map defining a plurality of fuel pulse widths for corresponding pairs of defined engine operating parameters;
b) adjusting fuel pulse width at least one increment in one of a rich and a lean direction of operation for a specific pair of engine operating parameters, determining if engine performance is one of improved, not improved, and degraded after each adjustment, and if improvement is detected continuing said adjustment until one of no improvement and degradation in performance is detected;
c) reversing direction of adjustment at least one increment when degradation in performance is detected; and
d) repeating said steps "a" through "c" for any additional pairs of engine parameters at which said engine is operated.
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Accused Products
Abstract
A method and apparatus are disclosed for controlling operation of a spark-ignited internal combustion engine by adjusting pulse width of fuel injected into the engine. An initial fuel pulse width is set for respective pairs of engine operating parameters such as engine speed and manifold pressure. The pulse width is adjusted by a control, for each pair of parameters, to obtain maximum performance, for example, as indicated by a torque detector. Each time a pulse width is adjusted, all previously adjusted pulse widths are compared with corresponding pulse widths in stored template fuel maps. The best matched template fuel map is then used in conjunction with all previously adjusted points to create a new operational fuel map to run the engine until a more updated operational fuel map can be created upon additional fuel pulse widths being tuned.
68 Citations
40 Claims
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1. A method for controlling an electronic fuel delivery system, comprising:
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a) running an engine by at least injecting fuel into said engine in fuel pulse width amounts for specific pairs of engine operating parameters corresponding to fuel pulse widths in an initial fuel map, said initial fuel map defining a plurality of fuel pulse widths for corresponding pairs of defined engine operating parameters; b) adjusting fuel pulse width at least one increment in one of a rich and a lean direction of operation for a specific pair of engine operating parameters, determining if engine performance is one of improved, not improved, and degraded after each adjustment, and if improvement is detected continuing said adjustment until one of no improvement and degradation in performance is detected; c) reversing direction of adjustment at least one increment when degradation in performance is detected; and d) repeating said steps "a" through "c" for any additional pairs of engine parameters at which said engine is operated. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12)
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7. A method for controlling an electronic fuel delivery system, comprising:
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a) running an engine by at least injecting fuel into said engine in fuel pulse width amounts for specific pairs of engine operating parameters corresponding to fuel pulse widths in an initial fuel map, said initial fuel map defining a plurality of fuel pulse widths for corresponding pairs of defined engine operating parameters; b) adjusting said pulse width at least one increment in one of a rich and a lean direction of operation for specific pair of engine operating parameters, determining if engine performance is one of improved, not improved, and degraded after each adjustment, and if improvement is detected continuing said adjustment until one of no improvement and a degradation in performance is detected; c) adjusting said pulse width at least one increment in a reverse direction for said specific pair of engine operating parameters when at least one of no improvement and a degradation in performance is detected in step "b"; and
determining if engine performance is one of improved, not improved, and degraded after each adjustment, and if improvement is detected continuing said adjustment for said specific pair of engine operating parameters until one of no improvement and a degradation in performance is detected;d) adjusting said pulse width at least one increment in a reverse direction for said specific pair of engine operating parameters when at least one of no improvement and a degradation in performance is detected in step "c" resulting in a tuned state for said specific pair of engine operating parameters; and e) repeating said steps "a" through "d" for any additional pairs of engine parameters at which said engine is operated. - View Dependent Claims (8, 9, 10, 13, 14, 15, 16, 17, 18)
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19. An apparatus for controlling an electronic injector fuel delivery system, comprising:
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means for controlling fuel pulse widths for fuel being fed to a running engine in accordance with an initial stored fuel map correlating fuel pulse widths to respective pairs of a plurality of pairs of engine operating parameters; means for adjusting said fuel pulse width at least one increment for a pair of engine operating parameters at which said engine is operating in one of a rich and a lean direction of operation, means for receiving input from a detector for detecting at least one of whether engine performance improves does not improve and degrades upon each pulse width adjustment, and including means for causing said means for adjusting to reverse direction of adjustment upon one of no improvement and a degradation being detected; and means for causing reversal of said adjustment at least one increment upon a degradation being detected after adjustments being done in said reversed direction. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus for controlling an electronic injector fuel delivery system, comprising:
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means for controlling fuel pulse widths for fuel being fed to a running engine, in accordance with an initial stored fuel map correlating fuel pulse widths to respective pairs of a plurality of pairs of engine operating parameters; means for adjusting aid fuel pulse width at least one increment for a pair of engine operating parameters at which said engine is operating, in one of a rich and a lean direction of operation; means for receiving input from a detector for detecting at least one of whether engine performance improves, does not improve and degrades upon each pulse width adjustment; means for continuing adjusting said fuel pulse width at least one increment for said pair of engine operating parameters as long as said detector detects improvement, until said detector detects one of no improvement or degradation; means for causing said means for adjusting to adjust said fuel pulse width at least one increment in a reverse direction for a pair of engine operating parameters upon one of no improvement and a degradation being detected; and
means for continuing adjusting said fuel pulse width at least one increment for said pair of engine operating parameters as long as said detector detects improvement, until said detector detects one of no improvement or degradation;means for causing said means for adjusting to adjust said fuel pulse width at least one increment in a reverse direction for a pair of engine operating parameters upon a degradation being detected resulting in a tuned state for said specific pair of engine operating parameters. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 38)
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36. A method for adjusting a fuel pulse width of a specific pair of engine operating parameters to improve performance, comprising the steps of:
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a) adjusting said fuel pulse width at least one increment in one of a rich and a lean direction of operation for said specific pair of engine operating parameters; b) determining if engine performance is one of improved, not improved, and degraded; c) if improved, repeat steps "a" through "c", and if not improved or degraded, go to step "d"; d) adjusting said fuel pulse width at least one increment in a reverse direction; e) determining if engine performance is one of improved, not improved, and degraded; f) if improved, repeat steps "d" through "f", and if not improved or degraded, go to step "g"; and g) adjusting said fuel pulse width at least one increment in a reverse direction resulting in a tuned state for said specific pair of engine operating parameters. - View Dependent Claims (37, 39, 40)
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Specification