Browse Prior Art Database

Automotive Engine Parameter Card for a Personal Computer System

IP.com Disclosure Number: IPCOM000122659D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Landry, JA: AUTHOR [+6]

Abstract

This article describes a personal computer (PC) attachment card for fetching information from automobile engine timing signals.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 67% of the total text.

Automotive Engine Parameter Card for a Personal Computer System

      This article describes a personal computer (PC)
attachment card for fetching information from automobile engine
timing signals.

      An engine under test is attached to circuitry which includes
sensors and circuits to digitize the analog signals from the sensors.
The outputs of the circuits go to a PC engine parameter card (EPC)
which is the attachment card disclosed herein.

      The EPC is an attachment card for the Intel Family 2
80386-based computer.  The EPC is an intelligent interface between
the PC and a customer-defined vehicle interface.

      Fig. 1 shows the circuit details for the EPC.  This card
measures the timings given in Fig. 2.  The timings denote signals
from the automotive engine.  For example, T1 occurs at each top dead
center (OT) for cylinder 1.

      The microprocessor in Fig. 1 uses latches, a pulse generator,
counters (CTRs) and interrupt logic to measure timings T1 through T8
in Fig. 2.  T1 to T6 set latches L1 to L4.  These latches attach to
the pulse generator which initiates an interrupt and resets the
corresponding CTR. For example, T6 (known as CYL1) sets latch L1,
which causes the pulse generator to reset CTR1, and generates INTR0
interrupt.

      The INTR0 signal executes code that resets latch L1, and reads
the previous value of CTR1.  The next time CYL1 occurs, the process
is repeated and the value read from CTR1 is used to compute t...