EP0110226A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Internal combustion engine control system with means for reshaping of command derived from accelerator control
Assignee: Mikuni Corp
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Filing: 1983-11-14
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Granted: —
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Expires: 2003-11-14
Abstract
Abstract An electronic control fuel injection system for a spark ignition internal combustion engine (12) is described wherein: a signal corresponding to the stroke imported to an accelerator pedal (28) by an operator is supplied to a computer (20) where, in a shaping section (32), a corresponding fuel demand signal is derived in accordance with a selected one (A, B or C) of a plurality of functions each specifying a respective predetermined relation between value of fuel command signal, corresponding to fuel flow rate, and accelerator pedal displacement. The fuel command signal of the representative of the selected fuel flow rate is then passed to a section (36) of the computer (20) which passes a corresponding control signal via line (27), to a fuel injector (22), and which also determines the corresponding optimum air flow rate and controls the opening of a throttle valve (16) to provide it. The selection of the respective function defining the relationship of the accelerator pedal movement to actual fuel flow command can be made by the operator or driver via a selector (34), to provide a desired engine response characteristic. Thus, the drive feeling for a vehicle can be varied within a range from normal to either a faster or more conservative engine reaction.
Inventors
- 👤 Kazuhisa Hasumi
- 👤 Takashi Ishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 19:45
CPC Classifications
F; F02; F02D; F02D11/00; F02D11/06; F02D11/10; F02D11/105; F02D41/00; F02D41/24; F02D41/2406; F02D41/2409; F02D41/2422
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
I. An electronic fuel injection control system for an internal combustion engine (12) having a throttle valve (16) for regulating the air flow rate to the engine, fuel metering and injection means (22) for supplying fuel at a controllable rate to the engine, a movable accelerator control means (28) for producing an accelerator signal the value of which is significant of the displacement of said accelerator control from an idle position, and/or of a derivative or change with respect to time of such position, shaping means (32) for deriving, from the last mentioned signal, a power command signal the value of which is related to said accelerator signal by a selected one of a plurality of available predetermined functions, means (34) operable to select a desired said function from among said available functions, the system including computing means (20), incorporating said shaping means, and controlling said throttle valve (l6) and said fuel metering and injection means (22), in such a way as to ensure the supply, to the engine, of fuel and air in the desired ratio at a rate corresponding to the value of said power command signal.
Claim 2
Dependent Claim
207 words
An electronic control fuel injection system for a spark ignition internal combustion engine having a throttle valve (16) for regulating the air flow rate to the engine (12), the system comprising an accelerator pedal (28) having a stroke from an idle position to a maximum position; fuel command means (30, 20) driven by said pedal for producing a fuel command signal varying as a function of the displacement of said pedal from its idle position and/or derivatives or differences of said displacement with respect to time; reshaping means (32, 34) for selecting a particular said function; fuel metering and injection means (22) for metering fuel in accordance with the command from said fuel command means and for injecting said fuel into said engine; intake air flow sensing means for detecting the intake air flow to said engine; computing means (36) for selectively receiving-output signals from said fuel command means indicating said fuel discharge amount and from said intake air flow sensing means indicating actual air flow, and for calculating an optimum air supply amount, and throttle valve servo means (18) for determining the opening of said throttle valve (16) according to the output from said computing means to provide said optimum air supply amount to said engine.
Claim 3
Dependent Claim
88 words
A system according to claim 2 wherein said reshaping means is operable to select a desired one of a plurality of modes of operation, in one of which the numerical value of the fuel command signal varies in proportion to the accelerator pedal displacement, in another 'of which the value' of the fuel command signal varies as the square root of the accelerator pedal displacement, and in yet another of which the numerical valve of the fuel command signal varies as the square of the accelerator pedal displacement.
Claim 4
Dependent Claim
24 words
A system according to claim 2 or claim 3 wherein said fuel command means includes as part thereof a portion of said computing means.
Claim 5
Dependent Claim
252 words
An electronic control fuel injection system for a spark ignition internal combustion engine having a throttle valve (16) for regulating air flow rate to the engine (12), the system comprising: an accelerator pedal (28) having a stroke from an idle position to a maximum position; position signal means (30) for generating an accelerator position signal; fuel command means (20) driven by said position signal means (30) for producing a fuel command signal varying in accordance with a particular mathematical function of the distance of said pedal from its idle position; at least one fuel injector (22) for injecting said fuel into said engine in accordance with the value of said fuel command signal; calculator means (36) for initially calculating a raw, unconnected desired air flow rate A corresponding to optimum air flow for each fuel flow rate as delivered by said fuel metering means, and for later calculating corrected values; temperature detecting means (56) for detecting engine temperature and transmitting its value to said calculation means for calculating a corrected desired air flow rate A d ; air flow sensing means for detecting the actual amount of intake air A a being supplied to said engine at each instant; subtracting means for substracting continuously the value A from A d and generating a difference signal therefrom, and throttle valve servo means (18) driven by said difference signal for varying the opening of said throttle valve (16) to move the difference toward zero to provide said optimum air supply amount to said engine.
Claim 6
Dependent Claim
80 words
A system according to claim 4 having also; a second temperature sensing means for sensing ambient atmospheric temperature and sending a signal corresponding in value thereto to said calculator means to refine the value of the corrected derived air flow rate A d ; pressure sensing means (40) for sensing ambient atmospheric pressure and sending a signal corresponding in value thereto to said calculator means to refine further the value of the corrected desired air flow rate A d .
Claim 7
Dependent Claim
23 words
A system according to claim 4 having reshaping means for changing one said particular mathematical function to a different said particular mathematical function.
References Cited (Backward Citations)
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