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EP0078987A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Fuel injection detecting system for a diesel engine

Assignee: Nissan Motor Co Ltd
•
Filing: 1982-10-27
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Granted: —
•
Expires: 2002-10-27
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Abstract

Abstract A fuel injection detecting system is used with a diesel engine having a fuel injection nozzle, the nozzle including a movable member for effecting fuel injection into the engine when the valve member is displaced from its normal position and interrupting fuel injection when the valve member is returned to its normal position. The detecting system includes a sensor for sensing displacement of the valve member and generating a signal indicative thereof. A comparator is provided to compare the signal from the sensor with a reference signal and to generate a signal indicative of fuel injection via the nozzle. The detecting system also includes a device for preventing the fuel injection signal from including components unrelated to fuel injection via the nozzle. This device may disable the sensor for a predetermined period immediately after the first major displacement of the valve member. Alternatively, the device may adjust the reference voltage so as to hold the voltage thereof at a level exceeding that of all features of the sensor signal except the signal largest peak during each fuel injection.

Inventors

  • 👤 Sadao Takase
  • 👤 Yoshihisa Kawamura
  • 👤 Toyoaki Nakagawa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 20:23
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/401; F02D41/20; F02M; F02M65/00; F02M65/005; F02B; F02B3/00; F02B3/06; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/063; F02D41/2096; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 121 words
A fuel injection detecting system for a diesel engine having a fuel injection nozzle, the fuel injection nozzle including a movable valve member for effecting fuel injection into the engine when the valve member is displaced from its normal position and interrupting fuel injection when the valve member is returned to its normal position, the detecting system comprising: (a) means for sensing displacement of the valve member and generating a signal indicative thereof; (b) means for comparing the signal from the sensing means with a reference signal and generating a signal indicative of fuel injection via the fuel injection nozzle; and (c) means for preventing the fuel injection signal from including components unrelated to fuel injection via the fuel injection nozzle.
Claim 2
Dependent Claim 121 words
A fuel injection detecting system for a diesel engine having a fuel injection nozzle, the fuel injection nozzle including a movable valve member for effecting fuel injection into the engine when the valve member is displaced from its normal position and interrupting fuel injection when the valve member is returned to its normal position, the detecting system comprising: (a) means for sensing displacement of the valve member and generating a signal indicative thereof; (b) means for comparing the signal from the sensing means with a reference signal and generating a signal indicative of fuel injection via the fuel injection nozzle; and (c) means for preventing the fuel injection signal from including components unrelated to fuel injection via the fuel injection nozzle.
Claim 3
Dependent Claim 30 words
A fuel injection detecting system as recited in claim 1, wherein the preventing means includes means for varying the reference signal in accordance with the rotational speed of the engine.
Claim 4
Dependent Claim 43 words
A fuel injection detecting system as recited in claim 2, wherein the signal from the sensing means has a voltage depending on displacement of the valve member, and wherein the reference signal has a voltage depending on the rotational speed of the engine.
Claim 5
Dependent Claim 60 words
A fuel injection detecting system as recited in claim 1, wherein the preventing means includes means for permitting transmission of the fuel injection signal at least during the period of fuel injection via the fuel injection nozzle and interrupting transmission of the fuel injection signal for a preset period excluding the period of fuel injection via the fuel injection nozzle.
Claim 6
Dependent Claim 93 words
A fuel injection detecting system as recited in claim 4, wherein the permitting/interrupting means includes second means for generating a signal indicative of a predetermined period starting from the time at which the valve member first returns to its normal position after the peak of the displacement of the valve member and ending at a time prior to the start of the subsequent purposeful displacement of the valve member, and wherein the interruption of transmission of the fuel injection signal is effected during the period indicated by the signal from the second means.
Claim 7
Dependent Claim 65 words
A fuel injection detecting system as recited in claim 4, wherein the permitting/interrupting means includes second means for generating a signal indicative of a predetermined period in engine crank angle excluding the period of fuel injection via the fuel injection nozzle, and wherein the interruption of transmission of the fuel injection signal is effected during the period indicated by the signal from the second means.

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