초록 ▼

A method and apparatus for controlling the various functions of an internal combustion engine using a program-controlled microprocessor having a memory preprogrammed with various control laws and associated control schedules receives information concerning one or more engine operating parameters suc

A method and apparatus for controlling the various functions of an internal combustion engine using a program-controlled microprocessor having a memory preprogrammed with various control laws and associated control schedules receives information concerning one or more engine operating parameters such as manifold absolute pressure, throttle position, engine coolant temperature, air temperature, and engine speed or period and the like. These parameters are measured and then supplied to input circuits for signal conditioning and conversion to digital words usable by the microprocessor. The microprocessor system computes a command word indicative of a computer-commanded engine control operation and output circuitry responds to predetermined computer-generated commands and to the computed digital command words for converting them to corresponding pulse-width control signals for controlling such engine operations as fuel-injection, ignition timing, proportional and/or on-off EGR control, and the like.

대표청구항 ▼

A switchable range analog-to-digital converter system including a ramp-type A/D converter for converting an analog input signal into a binary number indicative of the value thereof, window counter means for defining a predetermined count duration noise immunity window and enabling said binary counte

A switchable range analog-to-digital converter system including a ramp-type A/D converter for converting an analog input signal into a binary number indicative of the value thereof, window counter means for defining a predetermined count duration noise immunity window and enabling said binary counter to operate throughout the period defined by said noise immunity window even if transient noise signals make it temporarily appear that the value of the ramp voltage is greater than the value of the analog input signal to temporarily discontinue the operation of the conversion process, and multiple count detection means associated with the output of said window counter for selectively extending the range of said converter system between at least first and second different and distinct multi-bit conversion accuracies, and means for storing a signal for selecting either a first or a second multi-bit converter mode of operation.