EP0239524A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Stepper motor control for fuel injection
Assignee: AIL Corp
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Filing: 1987-03-25
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Granted: —
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Expires: 2007-03-25
Abstract
Abstract A stepper motor (40) is used to position the pump rack (32A) via a preloaded compliant linkage (52,54,56) in a fuel injection pump, thereby exercising control over the end of injection event in response to various engine operating parameters. One part (52) of the compliant linkage (52,54,56) is engaged with the output shaft (46) of the stepper motor (40). A stop (96) is provided at the zero throttle position of the engaged part (52) of the linkage (52,54,56), at the extreme distal end of its positional range. A position sensor (l00) is located at a predetermined reference position away from the stop (96) to provide a signal indicative of the engaged part (52) being at that position. When the stepper motor (40) is advanced to move the engaged part (52) away from the stop (96), the pulse count to the stepper motor is rereferenced when the reference position is reached.
Inventors
- 👤 Eric Day
- 👤 John H. Ii Field
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 23:02
CPC Classifications
F; F02; F02D; F02D1/00; F02D1/02; F02D1/08; F02D1/10; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/406; F02D41/407; F02D2250/00; F02D2250/16; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
269 words
A fuel injection system for an engine (l2) comprising: a fuel injection pump (18); movable and positionable plunger means (20) for injecting, and metering fuel to the cylinder(s) of the engine (12); camshaft means (16) connected to the engine (12) for moving the plunger means (20) and for causing the injecting of fuel to the cylinder(s); positionable pump rack means (32) connected to the plunger means (20) for positioning the plunger means (20) and for causing the metering of fuel to the cylinder(s); and a stepper motor (40) connected via a compliant preloaded linkage to the pump rack means (32) for positioning the pump rack means (32) in response to an engine operating parameter, wherein a distal portion (52) of the linkage is engaged with the stepper motor output shaft (46); controller means (28) providing a desired position signal (44) to the stepper motor (40); stop means (98) limiting the distal movement of the distal portion of the linkage; a position sensor (100) adjacent the distal portion of the linkage providing a signal to the controller indicative of a predetermined reference position of the distal portion, wherein the reference position is displaced from the stop; means for storing a value for the predetermined reference position in the controller; means for providing pulses from the controller to the stepper motor to cause the distal portion of the linkage to move away from the stop to the reference position; and means for rereferencing the pulse count in the controller in response to the signal from the position sensor indicating that the distal portion of the linkage is at the reference position.
Claim 2
Dependent Claim
269 words
A fuel injection system for an engine (l2) comprising: a fuel injection pump (18); movable and positionable plunger means (20) for injecting, and metering fuel to the cylinder(s) of the engine (12); camshaft means (16) connected to the engine (12) for moving the plunger means (20) and for causing the injecting of fuel to the cylinder(s); positionable pump rack means (32) connected to the plunger means (20) for positioning the plunger means (20) and for causing the metering of fuel to the cylinder(s); and a stepper motor (40) connected via a compliant preloaded linkage to the pump rack means (32) for positioning the pump rack means (32) in response to an engine operating parameter, wherein a distal portion (52) of the linkage is engaged with the stepper motor output shaft (46); controller means (28) providing a desired position signal (44) to the stepper motor (40); stop means (98) limiting the distal movement of the distal portion of the linkage; a position sensor (100) adjacent the distal portion of the linkage providing a signal to the controller indicative of a predetermined reference position of the distal portion, wherein the reference position is displaced from the stop; means for storing a value for the predetermined reference position in the controller; means for providing pulses from the controller to the stepper motor to cause the distal portion of the linkage to move away from the stop to the reference position; and means for rereferencing the pulse count in the controller in response to the signal from the position sensor indicating that the distal portion of the linkage is at the reference position.
Claim 3
Dependent Claim
32 words
The system of claim 1, wherein: the reference position is located a distance corresponding to a least one-quarter of the repeating stepper motor excitation coil sequence away from the stop means (98).
References Cited (Backward Citations)
No citation records indexed.
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