Electronic fuel injection control system for an internal combustion engine

An electronic control system for controlling the delivery of fuel to a compression ignition engine having plural cylinders, a crankshaft, air intake means for the cylinders, an injector for each cylinder for delivering the fuel to the cylinders sequentially, and a manual speed control means, said electronic control system comprising:

• programmable logic means adapted to be operated under the control of a stored program,
• memory means operatively coupled with the logic means and including first, second and third registers and including a first, second and third memory parts,
• a computation program stored in said first memory part and being adapted to control said logic means,
• first means including a first sensor adapted to be operatively coupled with the crankshaft for generating an actual speed signal and for storing it in the first register,
• second means including a second sensor adapted to be coupled with said manual speed control means for generating a commanded speed signal and for storing it in the second register,
• said second memory part containing a first set of data which defines a functional relationship representing a percent load fuel quantity signal for each different set of correlated values of actual speed signal and commanded speed signal,
• said logic means being operatively coupled, under the control of said computation program, to said first and second registers and said second memory part for deriving a percent load fuel quantity signal corresponding to said actual speed signal and said commanded speed signal,
• third means including a third sensor adapted to be operatively coupled with said air intake means for generating an air intake signal indicative of a selected condition of the air being supplied to the engine and for storing the air intake signal in said third register,
• said third memory part containing a second set of data which defines a functional relationship representing a full load fuel quantity signal for each different set of correlated values of actual speed signal and air intake signal,
• said logic means being operatively coupled, under the control of said computation program, to said first and third registers and said third memory part for deriving a full load fuel quantity signal corresponding to the actual speed signal and the air intake signal,
• said logic means being operative, under the control of said computation program, for comparing the percent load fuel quantity signal and the full load fuel quantity signal and for producing a fuel metering control signal corresponding in value to the lesser of the fuel quantity signals,
• and output means for applying the fuel metering control signal to the fuel injector for the cylinder which is next in the sequence of said cylinders.

An electronic control system for controlling the delivery of fuel to a compression ignition engine having plural cylinders, a crankshaft, air intake means for the cylinders, an injector for each cylinder for delivering the fuel to the cylinders sequentially, and a manual speed control means, said electronic control system comprising:

• programmable logic means adapted to be operated under the control of a stored program,
• memory means operatively coupled with the logic means and including first, second, third, fourth and fifth registers, and including first, second and third memory parts,
• a computation program stored in said first memory part and being adapted to control said logic means,
• first means including a first sensor adapted to be operatively coupled with the crankshaft for generating an actual speed signal and for storing it in said first register,
• second means including a second sensor adapted to be coupled with said manual speed control means for generating a commanded speed signal and for storing it in said second register,
• said logic means being operatively coupled, under the control of said computation program, to said first and second registers for computing a fuel metering control signal as a function of said actual speed signal and said commanded speed signal and for storing the fuel metering control signal in said third register,
• said second memory part containing a set of data which defines a functional relationship representing an injection advance signal for each different set of correlated values of the actual speed signal and the fuel metering control signal,
• said logic means being operatively coupled, under the control of the computation program, to said first register and said fourth register for deriving an injection advance signal corresponding to the actual speed signal and the fuel metering control signal and for putting the injection advance signal in said fifth register,
• and output means operatively coupled with the third and fifth registers for applying the fuel metering control signal and the injection advance signal to the fuel injector for the cylinder which is next in the sequence of said cylinders.

An electronic control system for controlling the delivery of fuel to a compression ignition engine having plural cylinders, a crankshaft, air intake means for the cylinders, an injector for each cylinder for delivering the fuel to the cylinders sequentially, and a manual speed control means, said electronic control system comprising:

• programmable logic means adapted to be operated under the control of a stored program,
• memory means operatively coupled with the logic means and including first, second, third, fourth and fifth registers, and first, second, third and fourth memory parts,
• a computation program stored in said first memory part and being adapted to control said logic means,
• first means including a first sensor adapted to be operatively coupled with the crankshaft for generating an actual speed signal and for storing it in said first register,
• second means including a second sensor adapted to be coupled with said manual speed control means for generating a commanded speed signal and for storing it in said second register,
• said second memory part containing a first set of data which defines a functional relationship representing a percent load fuel quantity signal for each different set of correlated values of actual speed signal and commanded speed signal,
• said logic means being operatively coupled, under the control of said computation program, to said first and second registers and to said second memory part for deriving a percent load fuel quantity signal corresponding to said actual speed signal and said commanded speed signal,
• third means including a third sensor adapted to be operatively coupled with said air intake means for generating an air intake signal indicative of a selected condition of the air being supplied to the engine and for storing the air intake signal in said third register,
• said third memory part containing a second set of data which defines a functional relationship representing a full load fuel quantity signal for each different set of correlated values of actual speed signal and air intake signal,
• said logic means being operatively coupled, under the control of said computation program, to said first and third registers and said third memory part for deriving a full load fuel quantity signal corresponding to the actual speed signal and the air intake signal,
• said logic means being operative, under the control of said computation program, for comparing the percent load fuel quantity signal and the full load fuel quantity signal and for producing a fuel metering control signal corresponding in values to the lesser of the fuel quantity signals and for putting the fuel metering control signal in said fourth register,
• said fourth memory part containing a third set of data which defines a functional relationship representing an injection advance signal for each different set of correlated values of the actual speed signal and the fuel metering control signal,
• said logic means being operatively coupled, under the control of the computation program, to said first register and said fourth register for deriving an injection advance signal corresponding to the actual speed signal and the fuel metering control signal and for putting the injection advance signal in the fifth register,
• and output means operatively coupled with the fourth and fifth registers for applying the fuel metering control signal and the injection advance signal to the fuel injector for the cylinder which is next in the sequence of said cylinders.

An electronic control system for controlling the delivery of fuel to a compression ignition engine having plural cylinders, a crankshaft, air intake means for the cylinders, an injector for each cylinder for delivering the fuel to the cylinders sequentially, and a manual speed control means, said electronic control system comprising:

• programmable logic means adapted to be operated under the control of a stored program,
• memory means operatively coupled with the logic means and including first, second, third and fourth registers, a plurality of other registers, and including first and second memory parts,
• a computation program stored in said first memory part and being adapted to control said logic means,
• an interrupt program stored in said second memory part and being adapted to control said logic means,
• signal developing means including a plurality of sensors adapted to be connected with said engine for generating a plurality of condition signals each corresponding with a given operating condition of the engine,
• said logic means being operatively coupled, under the control of said interrupt program, to said signal developing means for putting the plurality of condition signals respectively in said plurality of registers,
• one of said sensors being adapted to be operatively coupled to said crankshaft for generating an interrupt signal at a predetermined angular position of the crankshaft to initiate said interrupt program to update the signals in said plurality of registers,
• said logic means being operatively coupled, under the control of said computation program, to selected ones of said plurality of registers for computing a fuel metering control signal and storing it in said first register, said control signal having a value representing the time duration of a fuel pulse for the fuel injector for a given cylinder in the sequence of said cylinders and for computing an injection advance signal and storing it in said second register, said advance signal having a value representing the angular position of said crankshaft for the initiation of fuel injection,
• a table of trim data signals stored in said third register, said trim data signals representing data for computing an adjustment for said fuel metering control signal to produce the desired fuel quantity according to a calibration of each individual injector,
• said logic means being operatively coupled, under the control of one of said programs, to said third register and to said first register for modifying the fuel metering control signal in accordance with a predetermined function of said trim data signals and for storing the modified fuel metering control signal in said fourth register,
• and output means for applying the modified fuel metering control signal to the fuel injector for the cylinder which is next in the sequence of said cylinders.

An electronic control system for controlling the delivery of fuel to a compression ignition engine having plural cylinders, a crankshaft, air intake means for the cylinders, an injector for each cylinder for delivering the fuel to the cylinders sequentially, and a manual speed control means, said electronic control system comprising:

• programmable logic means adapted to be operated under the control of a stored program,
• memory means operatively coupled with the logic means and including first and second memory parts, first and second registers and a plurality of registers,
• a computation program stored in said first memory part and being adapted to control said logic means,
• an interrupt program stored in said second memory part and being adapted to control said logic means,
• signal developing means including a plurality of sensors adapted to be connected with said engine for generating a plurality of condition signals each corresponding with a given operating condition of the engine,
• said logic means being operative to start the computation program,
• said logic means being operatively coupled under the control of said interrupt program to said signal developing means for putting the plurality of condition signals, respectively, in said plurality of registers,
• one of said sensors being adapted to be operatively coupled to said crankshaft for generating an interrupt signal at a predetermined angular position of the crankshaft to initiate said interrupt program synchronously with engine operation to update the signals in said plurality of registers,
• said logic means being operative in response to completion of the interrupt program for resuming execution of said computation program,
• said logic means being operatively coupled, under the control of said computation program, to selected ones of said plurality of registers for computing a fuel metering control signal and storing it in said register and for computing an injection advance signal and storing it in said second register, whereby the computation and storage of the fuel metering control signal and the injection advance signal are performed asynchronously with respect to the operation of the engine,
• said logic means being operative under the control of said computation program to repeat the execution of the computation program when the execution thereof is complete,
• and output means adapted to be operatively coupled with the crankshaft and being operatively coupled with first and second registers for applying the fuel metering control signal and the injection advance signal to the fuel injector for the cylinder which is next in the sequence of said cylinders.