Patent EP0324450A2 successfully refreshed from Google Patents.
EP0324450A2
Expired / Lapsed
EP
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A fuel injection control device for use in an engine
Assignee: Toyota Motor Corp
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Filing: 1989-01-11
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Granted: —
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Expires: 2009-01-11
Abstract
Abstract A fuel injection control device comprising a fuel injector driven by a piezoelectric element. The piezoelectric element is charged with a electrons by using an LC resonant circuit, and the electrons charged in the piezoelectric element are discharged by using an LC resonant circuit. The piezoelectric element is driven before the regular injection is begun.
Inventors
- 👤 Masaki Mitsuyasu
- 👤 Naoyuki Tsuzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:09
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/3809; F02D41/3827; F02D41/20; F02D41/2096; F02M; F02M47/00; F02M47/02; F02M59/00; F02M59/20; F02M59/36; F02M63/00; F02M63/02; F02M63/0225; H; H02; H02N; H02N2/00; H02N2/02; H02N2/06; H02N2/065; H02N2/067
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
85 words
A fuel injection control device of an engine, comprising: a fuel injector having a piezoelectric element controlling an injection of fuel from said fuel injector; drive means for charging said piezoelectric element with electrons by using an LC resonant circuit and discharging electrons charged in said piezoelectric element by using an LC resonant circuit, to drive said piezoelectric element; and control means for controlling said drive means to drive said piezoelectric element at least once before a regular injection by said fuel injector is begun.
Claim 2
Dependent Claim
85 words
A fuel injection control device of an engine, comprising: a fuel injector having a piezoelectric element controlling an injection of fuel from said fuel injector; drive means for charging said piezoelectric element with electrons by using an LC resonant circuit and discharging electrons charged in said piezoelectric element by using an LC resonant circuit, to drive said piezoelectric element; and control means for controlling said drive means to drive said piezoelectric element at least once before a regular injection by said fuel injector is begun.
Claim 3
Dependent Claim
23 words
A fuel injection control device according to claim 1, wherein both of said LC resonant circuits comprise a coil and said piezoelectric element.
Claim 4
Dependent Claim
27 words
A fuel injection control device according to claim 1, wherein said control means begins to drive said piezoelectric element immediately after an ignition switch is made ON.
Claim 5
Dependent Claim
41 words
A fuel injection control device according to claim 3, wherein said control means repeatedly drives said piezoelectric element to alternately repeat a charged state of said piezoelectric element and a discharged state of said piezoelectric element until the engine is started.
Claim 6
Dependent Claim
56 words
A fuel injection control device according to claim 4, wherein said control means repeatedly begins to drive said piezoelectric element for a predetermined period until a starter switch is made ON, and said control means repeatedly begins to drive said piezoelectric element at a predetermined crankangle of the engine after said starter switch is made ON.
Claim 7
Dependent Claim
26 words
A fuel injection control device according to claim 5, wherein said predetermined period is shorter than a period at which said regular injection is carried out.
Claim 8
Dependent Claim
23 words
A fuel injection control device according to claim 5, wherein said predetermined period becomes shorter as a temperature of the engine becomes higher.
Claim 9
Dependent Claim
34 words
A fuel injection control device according to claim 7, wherein both a period of said charged state and a period of said discharged state become longer as the temperature of the engine becomes higher.
Claim 10
Dependent Claim
26 words
A fuel injection control device according to claim 5, wherein said predetermined crankangle is smaller than a crankangle at which said regular injection is carried out.
Claim 11
Dependent Claim
23 words
A fuel injection control device according to claim 5, wherein said predetermined crankangle becomes larger as a temperature of the engine becomes higher.
Claim 12
Dependent Claim
53 words
A fuel injection control device according to claim 10, wherein said regular injection is carried out when said piezoelectric element is in the charged state and, before the engine is started, the crankangle at which said piezoelectric element is in the discharged state becomes larger as the temperature of the engine becomes higher.
Claim 13
Dependent Claim
37 words
A fuel injection control device according to claim 11, wherein the crankangle at which said piezoelectric element is in the charged state is determined so as to inject an amount of fuel necessary to start the engine.
Claim 14
Dependent Claim
32 words
A fuel injection control device according to claim 11, wherein the crankangle at which said piezoelectric element is in the charged state becomes smaller as the temperature of the engine becomes higher.
Claim 15
Dependent Claim
62 words
A fuel injection control device according to claim 5, wherein said fuel injector is a unit injector having a plunger which is driven by the engine and pressurizes fuel, and, after said starter switch is made ON, said control means initially drives said piezoelectric element at a crankangle such that said piezoelectric element is driven when said plunger is pressurizing the fuel.
Claim 16
Dependent Claim
33 words
A fuel injection control device according to claim 4, wherein said control means does not drive said piezoelectric element when the number of times said piezoelectric element is driven exceeds a predetermined number.
Claim 17
Dependent Claim
23 words
A fuel injection control device according to claim 15, wherein said predetermined number becomes smaller as a temperature of the engine becomes higher.
Claim 18
Dependent Claim
33 words
A fuel injection control device according to claim 1, wherein said control means begins to drive said piezoelectric element after a starter switch is made ON and before said regular injection is begun.
Claim 19
Dependent Claim
36 words
A fuel injection control device according to claim 17, wherein said control means begins to drive said piezoelectric element at a compression stroke of the engine, and said regular injection is begun at said compression stroke.
Claim 20
Dependent Claim
36 words
A fuel injection control device according to claim 17, wherein said control means begins to drive said piezoelectric element at an intake stroke of the engine, and said regular injection is begun at said intake stroke.
Claim 21
Dependent Claim
56 words
A fuel injection control device according to claim 17, wherein said fuel injector is an injector in which said regular injection of fuel is carried out when electrons charged in said piezoelectric element are discharged, and the electrons charged in said piezoelectric element are initially discharged when said control means begins to drive said piezoelectric element.
Claim 22
Dependent Claim
41 words
A fuel injection control device according to claim 17, wherein said regular injection is carried out when said piezoelectric element is in a discharged state, and a period of said discharged state is shorter than a period of said regular injection.
Claim 23
Dependent Claim
28 words
A fuel injection control device according to claim 17, further comprising a fuel pump driven by the engine and feeding a high pressure fuel to said fuel injector.
Claim 24
Dependent Claim
34 words
A fuel injection control device according to claim 1, wharein said control means begins to drive said piezoelectric element after an ignition switch is made ON and before a starter switch is made ON.
Claim 25
Dependent Claim
28 words
A fuel injection control device according to claim 23, further comprising a fuel pump drive by the engine and feeding a high pressure fuel to said fuel injector.
Claim 26
Dependent Claim
52 words
A fuel injection control device according to claim 23, wherein said piezoelectric element is provided for each cylinder of the engine, and said control means begins to drive all of said piezoelectric elements at the same time after said ignition switch is made ON and before said starter switch is made ON.
Claim 27
Dependent Claim
41 words
A fuel injection control device according to claim 23, wherein said regular injection is carried out when said piezoelectric element is in a discharged state, and a period of said discharged state is shorter than a period of said regular injection.
References Cited (Backward Citations)
No citation records indexed.
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