A computer aided coordinate digitizing system is arranged to read data from construction drawings and make construction estimates from the data. A digitizing device determines a series of X-Y coordinate positions on a flat surface by means of a pointer placed at selected positions on the surface and a sensor assembly for detecting the position of the pointer. The device generates X-Y coordinate signals which are transmitted to a computer associated with the device. The computer is programmed to use the received X-Y coordinate signals to perform calculations in response to entry of computer control functions by an operator using a voice recognition unit which converts vocal commands into computer control signals to operate the computer and initiate the selected computer programs for performing construction estimates.

Computer aided coordinate digitizing system

A microprocessor controlled digital engine analyzer receives analog input signals from an engine being analyzed, engine parameter data entered via a keyboard, and function data, selecting one of several operating modes for the analyzer and which information is to be displayed, entered via the keyboard, and displays on a CRT screen the selected information such as cylinder firing order, RPM, Dwell, KV and DC volts, alphanumerically, information such as primary and secondary ignition and voltage, alternator and fuel injector information through the use of continuous waveform patterns, and additional information pertaining to Dwell, KV and Cylinder Shorting through the use of bar graphs. The waveform pattern data derived from the analog input signals is stored in a dual bank waveform memory and read out for display on the CRT screen under hardware control, and address data representing alphanumeric data and screen formats for the various operating modes to be displayed is stored in a dual bank display memory for application to a character generator, a bank switching arrangement being used for both the waveform memory and the display memory to enable the banks of each memory to be alternately written to and read from. A main microprocessor receives and processes analog input signals, other than the waveform pattern signals, and a display microprocessor receives numerical data from the main microprocessor and causes display of the numerical data on the CRT screen.

Digital engine analyzer

A method for accurately determining the measure of mass airflow into an internal combustion engine determines measures of various engine parameters and implements the mathematical modeling technique of prediction and estimation

Engine with prediction/estimation air flow determination

An engine--powertrain--controller combination includes a microprocessor control unit which predicts a future value of an engine state and uses that predicted value in engine control functions for improved control of the engine--powertrain in such areas as air-fuel ratio control, control of the engine during engine idle, and engine spark timing control.

Method for predicting R-step ahead engine state measurements

A method and apparatus disclosed provide dynamic prediction of re-circulated exhaust gas content in an engine intake manifold. An engine-controller combination, comprises a vehicle engine and an exhaust gas re-circulation valve providing re-circulation of engine exhaust gas. Several sensors determine measures of a set of engine parameters and provide measurement signals indicative of the measures. A microprocessor control unit receives the measurement signals, (ii) predicts future values of MAP and Po, where MAP represents an absolute pressure of an engine intake manifold and where Po represents a new air partial pressure of the engine intake manifold, and (iii) controls the vehicle engine in response to the predicted future values of MAP and Po.

Apparatus with dynamic prediction of EGR in the intake manifold

The amount of air entering an engine is determined by selecting the more accurate of two airflow determination means. One means measures a parameter characterizing airflow into the engine and has an adaptive correction. Another means calculates airflow into the engine as a function of engine speed and air density and has an adaptive correction.

Hybrid airflow measurement

Digital computer comprising input circuitry for a plurality of input lines

Improved processing of binary output data bytes and associated desired output times is provided. The binary output data and desired output times are placed in a self-sorting stack. Entries are time-ordered based on their respective desired output times. A real time counter is used in comparing the stack entries, one-by-one, with real time. The entry with the earliest desired output time, except in the case of an output interrupt, is compared before any other desired output time associated with a byte of output data. CPU control of the stack is not required and digital computer throughput is increased. Interruption of the CPU programming is avoided relative to transmission of outputs.

Binary output processing in a digital computer using a time-sorted stack

A digital computer having a real time counter and a memory/address bus uses binary input data comprising a plurality of bits of information to generate output information in response to a program. The invention provides improved processing of the binary input data. A transition from one state to another of one or more of the bits of binary input data causes a byte of binary input data containing the bit or bits having undergone transition to be placed in an input holding register. Also, the real time at which the transition occurred is placed in a capture-time holding register. The contents of the input holding and capture-time holding registers are repetitively placed in a stack as pending input data bytes. The pending input data bytes are accessible to the computer central processing unit, as required by the program, via the memory/address bus.

Brian S. Edelman

Papers

Hybrid airflow measurement

Digital computer comprising input circuitry for a plurality of input lines

Binary output processing in a digital computer using a time-sorted stack

Binary input processing in a computer using a stack

Processing input and output data