Fuel injection control system for an automotive engine

• US 4,913,118 A
• Filed: 03/28/1989
• Issued: 04/03/1990
• Est. Priority Date: 04/01/1988
• Status: Expired due to Fees

• Current Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Original Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Inventors: Watanabe, Hideo
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US07/330,592
• Time in Patent Office: 371 Days
• Field of Search: 123/435, 123/489, 73/117.3
• US Class Current: 123/435
• CPC Class Codes: F02D 2200/0402 the parameter being determined by using a model of the engine intake or its components
• CPC Class Codes: F02D 2200/0606 Fuel temperature
• CPC Class Codes: F02D 35/023 by determining the cylinder pressure
• CPC Class Codes: F02D 35/025 by determining temperatures inside the cylinder, e.g. combustion temperatures
• CPC Class Codes: F02D 41/008 Controlling each cylinder individually
• CPC Class Codes: F02D 41/18 by measuring intake air flow
• CPC Class Codes: F02D 41/32 of the low pressure type F02D41/3082 takes precedence

Abstract

A fuel injection control system has a pressure sensor for sensing pressure in each cylinder of an engine, a temperature sensor for sensing temperature of a cylinder of the engine. A quantity of intake air at a predetermined crank angle is calculated based on the detected pressure and temperature. A fuel injection pulse width is calculated based on the calculated quantity of intake air.

Claims

1. A system for controlling fuel injection for an automotive engine having at least one fuel injector, comprising:

a pressure sensor for sensing pressure in each cylinder of said engine and for producing a pressure signal;

a temperature sensor for sensing temperature of a cylinder of said engine and for producing a temperature signal;

a timing sensor for sensing a predetermined crank angle with respect to each cylinder and for producing a timing signal at the crank angle;

first calculator means responsive to the pressure signal, the temperature signal and the timing signal for calculating quantity of intake air at the time of the timing signal;

second calculator means for calculating a fuel injection pulse width based on the calculated quantity of intake air; and

driver means for actuating said fuel injector in accordance with said fuel injection pulse width.

2. The system according to claim 1 wherein said temperature sensor is provided for each cylinder.

3. The system according to claim 1 further comprising an O₂ -sensor for producing a feedback signal representing air-fuel ratio of mixture supplied to cylinders of said engine, and correcting means for correcting the fuel injection pulse width in accordance with the feedback signal.