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US 6,202,629 B1Granted
Engine speed governor having improved low idle speed stability
OwnerG. George Zhu, Albert E. Sissoninventors
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OwnerG. George Zhu, Albert E. Sissoninventors
Estimating the term…
A system and method for controlling the speed of an engine, or a speed governor, receives an error signal indicative of the difference between the actual engine speed and a commanded engine speed. This error signal is passed through a linear controller that determines a fuel flow rate in units of volume per unit time. The fuel flow rate is a substantially linear function of engine speed, and more specifically engine speed error. The output of the linear controller is fed to a non-linear compensator that determines a fueling command signal as a non-linear function of actual engine speed and fuel flow rate. The speed governor can accurately control engine speeds at low idle conditions. In one embodiment, the non-linear compensator utilizes a three-dimensional table of fueling command values as a function of fuel flow rate and engine speed. In another embodiment, the compensator applies a transfer function utilizing low and high calibration speed values enveloping a low engine speed. In another feature of the invention, a speed sensing system applies a zero order sample and hold to a sensor pulse train to generate a preliminary speed signal. This preliminary speed signal is fed to a software-based first order sample and hold component that calculates an integrated error value, leading to a speed signal value that is substantially free from frequency aliasing.
A method for controlling the speed of an internal combustion engine having an engine speed sensor for generating an engine speed signal indicative of the actual engine speed and a fuel system responsive to a fuel control signal to fuel the engine, the method comprising the steps of:
A system for controlling the speed of an internal combustion engine having an engine speed sensor for sensing actual engine speed and a fuel system having a flow control valve responsive to a fuel control signal to supply a quantity of fuel to the engine;
A system for controlling the speed of an internal combustion engine having an engine speed sensor for generating a signal indicative of the actual engine speed and a fuel system with a flow control valve responsive to a fuel control signal to supply a quantity of fuel to the engine, the system comprising:
Dependencies are inferred from the claim text.