Fuel injection system controlled by vehicle location system

• US 6,016,795 A
• Filed: 07/09/1998
• Issued: 01/25/2000
• Est. Priority Date: 07/14/1997
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Unisia Jecs Corporation (Hitachi, Ltd.)
• Inventors: Ohki, Hisatomo
• Primary Examiner(s): Wolfe, Willis R.
• Assistant Examiner(s): GIMIE, MAHMOUD
• Application Number:
  US09/112,143
• Time in Patent Office: 565 Days
• Field of Search: 123/672, 123/478, 123/480, 123/406.12, 701/213, 701/102, 701/103, 701/104, 701/105
• US Class Current: 123/681
• CPC Class Codes: F02D 2200/701 Information about vehicle position, e.g. from navigation system or GPS signal
• CPC Class Codes: F02D 35/0092 by means of fuel injection
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/1487 Correcting the instantaneous control value
• CPC Class Codes: F02D 41/28 Interface circuits
• CPC Class Codes: G01S 19/14 specially adapted for specific applications
• CPC Class Codes: G01S 19/49 whereby the further system is an inertial position system, e.g. loosely-coupled

Abstract

A vehicle location system detects the location where a vehicle is position. A control system controls a fuel injection system of an engine of the vehicle in such a manner that emission of the engine varies in accordance with the detected vehicle location.

Claims

1. A fuel injection control system for controlling an amount of fuel injected through a fuel injector to be fed to an internal combustion engine mounted on a motor vehicle, comprising:

an engine speed sensor issuing a rotation speed signal representing a rotation speed of the engine;

an air flow meter issuing an air amount signal representing an amount of air fed to the engine;

a basic fuel amount deriving unit that derives, in accordance with said rotation speed and air amount signals, a basic fuel amount to be injected by said fuel injector;

a vehicle position detecting device that issues a vehicle position signal representing the position where the vehicle is positioned;

a correction value deriving unit that derives, in accordance with said vehicle position signal, a correction value for said basic fuel amount; and

a correction unit that corrects said basic fuel amount in accordance with said correction value.

2. A fuel injection control system as claimed in claim 1, wherein said basic fuel amount deriving unit calculates the basic fuel amount in such a manner that an air/fuel mixture actually led into each combustion chamber of the engine shows a stoichiometric air/fuel ratio, and wherein said correction value deriving unit calculates the correction value in such a manner as to cause the air/fuel mixture to have a richer or leaner air/fuel ratio with respect to said stoichiometric ratio.

3. A fuel injection control system as claimed in claim 2, wherein said correction value deriving unit comprises:

an area determining section that, based on the vehicle position signal and map data, determines an area where the vehicle is actually located;

a correction value storing section that stores a plurality of correction values for a plurality of areas; and

a correction value selecting section that selects one of the correction values in accordance with the determined area.

4. A fuel injection control system as claimed in claim 1, wherein said vehicle position detecting device is at least one of a global positioning system (GPS), a stand-alone positioning system and a terrestrial radio positioning system.

5. A fuel injection control system as claimed in claim 1, wherein said vehicle position detecting device comprises a global positioning system (GPS) and a stand-alone positioning system.

6. A fuel injection control system as claimed in claim 1, wherein said correction unit corrects said basic fuel amount in such a manner as to have the engine produce emission that varies strictly in accordance with said vehicle position signal.

7. A fuel injection system as claimed in claim 1, wherein said fuel injector is arranged to inject fuel into an intake port of the engine.

8. A fuel injection control system as claimed in claim 1, wherein said vehicle position detecting device comprises:

a vehicle location system that detects a terrestrial point where the vehicle is positioned; and

a map data storing device that stores a plurality of terrestrial areas one of which includes the terrestrial point detected by said vehicle location system.