EP0245117A2
Expired / Lapsed
EP
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Fuel control apparatus for a fuel injection system of an internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1987-05-08
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Granted: —
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Expires: 2007-05-08
Abstract
Abstract A fuel control apparatus for a fuel injection system of an internal combustion engine (1) has an air flow sensor (13) for sensing the air flow rate into the air intake pipe (15) of the engine and producing an electrical output having a frequency which is proportional to the air flow rate, and a crank angle sensor (17) for producing an electrical output pulse each time the crank shaft of the engine is at a prescribed crank angle. A load detector (20) detects the number of output pulses from the air flow sensor (13) between consecutive output pulses of the crank angle sensor (17), and an air flow rate calculator (21) calculates the actual intake air flow rate into the cylinders of the engine based on the output of the load detector (20). A controller (22) controls the supply of fuel to fuel injectors (14) for the engine (1) based on the output of the calculator (21). The load detector (20) includes a frequency divider (31) which performs frequency division of the output from the air flow sensor when the load exceeds a prescribed level.
Inventors
- 👤 Kanno C/O Himeji Seisakusho Yoshiaki
- 👤 Nakamoto C/O Himeji Seisakusho Katsuya
- 👤 Sumitani C/O Himeji Seisakusho Jiro
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 03:58
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/24; F02D41/26; F02D41/28; F02D41/04; F02D41/045; F02D41/18; F02D41/185
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
A fuel control apparatus for a fuel injection system of an internal combustion engine, said fuel injection system having at least one fuel injector for supplying fuel to said engine, comprising: air flow sensing means for sensing the air flow rate into the air intake pipe of said engine and producing an electrical output having a frequency which is proportional to said air flow rate; crank angle sensing means for producing an electrical output pulse each time the crankshaft of said engine is at a prescribed crank angle; frequency division means for performing frequency division of the output signal of said air flow sensor when the engine load exceeds a prescribed value and for producing an output having the same frequency as the output of said air flow sensing means when the engine load is below said prescribed value; and control means for calculating the air flow rate into the cylinders of said engine based on the output of said frequency division means and said crank angle sensing means and for controlling said fuel injector based on said calculated air flow rate. -
Claim 2
Dependent Claim
183 words
A fuel control apparatus for a fuel injection system of an internal combustion engine, said fuel injection system having at least one fuel injector for supplying fuel to said engine, comprising: air flow sensing means for sensing the air flow rate into the air intake pipe of said engine and producing an electrical output having a frequency which is proportional to said air flow rate; crank angle sensing means for producing an electrical output pulse each time the crankshaft of said engine is at a prescribed crank angle; frequency division means for performing frequency division of the output signal of said air flow sensor when the engine load exceeds a prescribed value and for producing an output having the same frequency as the output of said air flow sensing means when the engine load is below said prescribed value; and control means for calculating the air flow rate into the cylinders of said engine based on the output of said frequency division means and said crank angle sensing means and for controlling said fuel injector based on said calculated air flow rate. -
Claim 3
Dependent Claim
69 words
A fuel control apparatus as claimed in Claim 1, wherein said control means includes means for controlling said frequency division means so as to perform frequency division when the number of output pulses of said air flow sensor between consecutive output pulses of said crank angle sensor exceeds a prescribed value, or when the period of the output pulses of said air flow sensor is below a prescribed value.
Claim 4
Dependent Claim
110 words
A fuel control apparatus for a fuel injection system of an internal combustion engine (1), the apparatus comprising an air flow sensor (13) for sensing air flow into an intake of the engine and for producing a signal dependent upon the air flow, characterised in that frequency division means (31) is provided for frequency dividing the signal when the engine load exceeds a predetermined value, which load is determined on the basis of the signal provided by the air flow sensor (13) between predetermined crank positions of the engine, and control means is provided for controlling the supply of fuel to the engine in dependence upon the frequency divided signal.
Claim 5
Dependent Claim
110 words
A fuel control apparatus for a fuel injection system of an internal combustion engine (1), the apparatus comprising an air flow sensor (13) for sensing air flow into an intake of the engine and for producing a signal dependent upon the air flow, characterised in that frequency division means (31) is provided for frequency dividing the signal when the engine load exceeds a predetermined value, which load is determined on the basis of the signal provided by the air flow sensor (13) between predetermined crank positions of the engine, and control means is provided for controlling the supply of fuel to the engine in dependence upon the frequency divided signal.
Claim 6
Dependent Claim
36 words
A fuel control apparatus according to claim 3, wherein the control means also controls the supply of fuel to the engine in dependence upon the temperature of the engine (1) and whether the engine is idling.
Claim 7
Dependent Claim
32 words
A fuel control apparatus according to claim 3 or claim 4, wherein the signal from the air flow sensor is not frequency divided when the engine load is below the predetermined value.
References Cited (Backward Citations)
No citation records indexed.
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