In-chassis determination of fuel injector performance
First Claim
1. An in-chassis fuel injector diagnostic system comprising:
- an engine mounted on a chassis;
a plurality of electronically controlled fuel injectors attached to said engine;
at least one electromotive sensor operably coupled to at least one of said electronically controlled fuel injectors; and
an electronic control module in communication with said electronically controlled fuel injectors and said at least one electromotive sensor, and including a fuel injector quantity deviation algorithm, and including a fuel injector timing deviation algorithm.
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Accused Products
Abstract
It is known that the performance of actual fuel injectors tends to deviate from performance of nominal fuel injectors in both quantity and timing of each fuel injection event. These deviations in timing and/or quantity can be a function of such variables as the on-time itself, rail pressure in the case of hydraulically actuated fuel injectors, and engine temperature. In addition, these variations in performance can change over the life of the fuel injector. Therefore, in order to accurately correct for performance deviations in each individual fuel injector, the invention can include an up-to-date diagnostic of that deviation in performance. The present invention includes in-chassis strategies for evaluating fuel injector performance deviations in both quantity and timing, and further includes software strategies for applying control signal adjustments to make all of the fuel injectors in a given engine behave more uniformly and more like a nominal fuel injector.
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Citations
20 Claims
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1. An in-chassis fuel injector diagnostic system comprising:
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an engine mounted on a chassis;
a plurality of electronically controlled fuel injectors attached to said engine;
at least one electromotive sensor operably coupled to at least one of said electronically controlled fuel injectors; and
an electronic control module in communication with said electronically controlled fuel injectors and said at least one electromotive sensor, and including a fuel injector quantity deviation algorithm, and including a fuel injector timing deviation algorithm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of determining a fuel injector performance deviation from nominal, comprising the steps of:
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estimating a fuel injection quantity deviation at least in part by operating an engine with less than all cylinders in a power mode, and determining at least one of an injector response and an engine response; and
estimating a fuel injection timing deviation at least in part by coupling an electromotive sensor with an electronically controlled valve of a fuel injector, and energizing the electronically controlled valve. - View Dependent Claims (15, 16, 17, 18)
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19. An in-chassis method of trimming fuel injector operation in an engine, comprising the steps of:
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performing timing deviation in-chassis diagnostic testing;
storing timing deviation data in memory;
performing quantity deviation in-chassis diagnostic testing;
storing timing deviation data in memory; and
adjusting a control signal to a fuel injector based at least in part on said quantity deviation data and said timing deviation data. - View Dependent Claims (20)
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Specification