Speed governor for an engine having an electronic fuel injection system

• US 3,889,647 A
• Filed: 07/02/1973
• Issued: 06/17/1975
• Est. Priority Date: 07/02/1973
• Status: Expired due to Term

• Current Assignee: Siemens-Bendix Automotive Electronics LP
• Original Assignee: Todd L. Rachel
• Inventors: Rachel, Todd L.
• Primary Examiner(s): Antonakas, Manuel A.
• Assistant Examiner(s): Cangelosi, Joseph
• Application Number:
  US05/375,580
• Time in Patent Office: 715 Days
• Field of Search: 123/106,102,32EA
• US Class Current: 123/353
• CPC Class Codes: F02D 31/006 for maximum speed control
• CPC Class Codes: F02D 41/0205 using an auxiliary engine speed control engine speed control per se F02D31/00

Abstract

Apparatus for use with an engine having an electronic fuel injection (EFI) system, and which apparatus governs engine speed to a predetermined set point. Engine speed is sensed and regulates the fuel supply to the engine whereupon fuel pressure is used as an actuating force to remove engine throttle commands from the control of the operator when the engine speed reaches the set point.

Claims

1. In an internal combustion engine including a fuel control system of the type having sensor means including means for generating an ac. signal at a frequency corresponding to engine speed, responsive to engine conditions operative to provide signals indicative of engine generating parameters, means responsive to the sensor means signals operative to provide a fuel delivery command signal indicative of the engine fuel requirements, fuel supply means responsive to the fuel delivery command signal operative to supply the engine with pressurized fuel in relation to the fuel delivery command signal and means for controlling mixture of fuel and air to the engine, the improvement comprising:

means for providing a d.c. signal corresponding to a predetermined set point speed;

a converter connected to the a.c. signal generating means for converting the engine speed signal therefrom to a d.c. signal;

means for comparing the d.c. set point speed signal and the d.c. engine speed signal and for providing an error signal;

means connected to the error signal means for providing a signal as a function of the error signal, the function signal being at a constant level when the error signal is in one sense and increasing linearly when the error signal is in an opposite sense;

fuel regulating means connected to the function signal means and to the fuel supply and responsive to the function signal for regulating said fuel supply, said regulated fuel supply providing a force; and

actuator means connected to the fuel regulating means and to the mixture control means and responsive to said force for actuating the mixture control means to control the mixture of air and fuel to the engine to maintain the predetermined set point speed.

2. In an internal combustion engine of the type including means for controlling the mixture of fuel and air to the engine, the improvement comprising:

means for providing pulses at a frequency corresponding to engine speed;

means for providing pulses at a frequency corresponding to a predetermined set point speed;

means for comparing said frequencies and for providing a pulse at a frequency which is the difference between the compared frequencies;

a pulse width modulator connected to the frequency comparing means for modulating the width of the pulse therefrom;

a supply of pressurized fluid;

regulating means including on-off flow valve means connected to the fluid supply and to the pulse width modulator and responsive to the modulated pulse for permitting pressurized fluid from the supply for a sufficient time to provide a force; and

actuator means connected to the regulating means and to the mixture control means and responsive to said force for actuating the mixture control means to control the mixture of air and fuel to the engine to maintain the predetermined set point speed.