Method of controlling injector

• US 4,798,188 A
• Filed: 11/30/1987
• Issued: 01/17/1989
• Est. Priority Date: 12/04/1986
• Status: Expired due to Fees

• Current Assignee: Aisan Kogyo Kabushiki Kaisha
• Original Assignee: Aisan Kogyo Kabushiki Kaisha
• Inventors: Ito, Shoji, Minoura, Mikio
• Primary Examiner(s): ARGENBRIGHT, TONY MICHAEL
• Application Number:
  US07/126,638
• Time in Patent Office: 414 Days
• Field of Search: 123/472, 123/478, 123/498, 123/490, 251/129.18, 239/585
• US Class Current: 123/478
• CPC Class Codes: F02D 41/2096 for controlling piezoelectric injectors drive and control circuit for piezoelectric devices in general H10N30/802
• CPC Class Codes: F02D 41/32 of the low pressure type F02D41/3082 takes precedence
• CPC Class Codes: F02M 51/0603 using piezoelectric or magnetostrictive operating means
• CPC Class Codes: F02M 51/0675 the valve body having cylindrical guiding or metering portions, e.g. with fuel passages
• CPC Class Codes: F02M 51/08 specially for low-pressure fuel-injection
• CPC Class Codes: F02M 61/161 Means for adjusting injection-valve lift

Abstract

In an injector for intermittently injecting liquid fuel by supplying a pulse signal to an actuator for reciprocating a valve body, a method of controlling the injector comprises the steps of changing the width of the pulse signal to thereby control an open time of the injector, and also changing a voltage of the pulse signal to thereby control a stroke of the valve body.

Claims

1. The method of controlling a fuel injector intermittently injecting liquid fuel to an engine comprising the steps of supplying a pulse signal to an actuator for reciprocating a valve body, varying the stroke of said valve body by a voltage signal applied to a stroke limiting member;

changing the width of said pulse signal to thereby control the open time of said injector, and varying the voltage applied to said stroke limiting member to thereby control the stroke of said valve body.

2. The method as defined in claim 1, wherein said stroke limiting member comprises a piezoelectric ceramic stack.

3. The method as defined in claim 1, wherein the voltage signal applied to the stroke limiting member is zero at high fuel flow range.

4. The method as defined in claim 1, wherein the voltage signal applied to the stroke limiting member is varied continuously to correspond to the fuel flow range.