# US 4,391,253 A · Electronically controlling, fuel injection method

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- Number: US 4,391,253 A
- Document ID: US4391253A
- Status: Granted
- Kind: A
- Application number: 06/257,132
- Filed: 1981-04-24
- Granted: 1983-07-05
- Earliest claimed: 1980-10-29
- Assignees: Toyota Jidosha Kogyo Kabushiki Kaisha
- Inventors: Sumio Ito
- Web page: https://patentgrep.com/patent/US4391253A

## CPC

- F02D 41/2454: {Learning of the air-fuel ratio control}
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)

## Abstract

In an electronically controlling, fuel injection method, wherein an electromagnetic fuel injection valve is controlled so as to control an amount of alcohol-containing-fuel being supplied into an intake system, a difference between a basic amount of fuel being injected and an actual amount of fuel being injected, or a ratio of the former to the latter, is stored in closed loop controlling in which an actual amount of fuel being injected is calculated by using air-fuel-ratio-feedback signals as parameters, the aforesaid basic amount of fuel being injected being calculated from operational parameters of the engine, besides an air-fuel ratio, and the aforesaid actual amount of fuel being injected being calculated by correcting the basic amount of fuel being injected on the basis of air-fuel-ratio-feedback signals; and the basic amount of fuel being injected is corrected on the basis of the aforesaid difference or ratio in open loop controlling, thereby calculating the actual amount of fuel being injected.

## Claims

### Claim 1

In an electronically controlling, fuel injection method, wherein a gasoline fuel containing alcohol is supplied via an electromagnetic fuel injection valve into an intake system of an engine; comprising the steps of:
storing in a storage means a comparison value representing a comparison of a basic amount of fuel being injected and an actual amount of fuel being injected, in closed loop controlling, said basic amount of fuel being injected calculated on the basis of operational parameters of the engine, and said actual amount of fuel being injected being determined by correcting said basic amount of fuel being injected on the basis of air-fuel-ratio feedback signals, and wherein a basic ignition timing is calculated on the basis of operational parameters of the engine, and said basic ignition timing is corrected on the basis of said comparison value, whereby an actual ignition timing is obtained; and
correcting said basic amount of fuel being injected on the basis of said comparison value, in open loop controlling, in order to determine an actual amount of fuel being injected.

### Claim 2 (depends on 1)

An electronically controlling, fuel injection method as defined in claim 1, wherein in order to calculate a basic amount of fuel being injected, an engine running speed and a flow rate of intake air are selected as operational parameters of the engine.

### Claim 3 (depends on 2)

An electronically controlling, fuel injection method as defined in claim 2, wherein said comparison value is stored in a means adapted for holding a memory therein even when an engine ignition switch has been turned off.

### Claim 4 (depends on 3)

An electronically controlling, fuel injection method as defined in claim 3, wherein an actual amount of fuel being injected in open loop controlling is a value obtained by adding a given value to the basic amount of fuel being injected.

### Claim 5 (depends on 1)

An electronically controlling, fuel injection method as defined in claim 1, wherein said basic ignition timing is a minimum advance for best torque in the case where a pure gasoline fuel is employed.

### Claim 6 (depends on 5)

An electronically controlling, fuel injection method as defined in claim 5, wherein, with increase in a concentration of alcohol in a fuel, the actual ignition timing makes earlier than the basic ignition timing.

### Claim 7 (depends on 5)

An electronically controlling, fuel injection method as defined in claim 5, wherein, with increase in a concentration of alcohol in a fuel, the actual ignition time makes later than the basic ignition timing.

### Claim 8 (depends on 1)

An electronically controlling, fuel injection method as defined in claim 1 wherein said comparison value is the difference between a basic amount of fuel being injected and an actual amount of fuel being injected.

### Claim 9 (depends on 8)

An electronically controlling, fuel injection method as defined in claim 8 wherein an actual amount of fuel being injected in open loop controlling is a value obtained by adding said difference to the basic amount of fuel being injected.

### Claim 10 (depends on 1)

An electronically controlling, fuel injection method as defined in claim 1 wherein said comparison value is the ratio of the basic amount of fuel being injected to the actual amount of fuel being injected.

### Claim 11 (depends on 10)

An electronically controlling, fuel injection method as defined in claim 10 wherein an actual amount of fuel being injected in open loop controlling is a value obtained by multiplying said basic amount of fuel being injected by said ratio.