Patent ID: 6708089
Filing Date: 2004-03-16
Classification: F02D

Abstract:
An on-vehicle electronic controller comprising:a microprocessor having a nonvolatile memory, in which a control program for a controlled vehicle and a control constant are written by an external tool, and a RAM memory for computation; direct input interface circuits and direct output interface circuits that are connected to a data bus of said microprocessor and handle high-speed inputs and outputs for engine drive control; a first serial-parallel converter connected to said microprocessor via the data bus, a second serial-parallel converter serially connected to said first serial-parallel converter, and a communication control circuit for serial communication connected to said second serial-parallel converter via a data bus; an output latch memory for storing control output signals transmitted via said first and second serial-parallel converters with respect to low-speed output signals of an auxiliary driving output and an alarm display output, and an indirect output interface circuit connected to an output terminal of said output latch memory; indirect input interface circuits each having a variable filter circuit provided with constant setting registers in which a filter constant is stored, and to which manually controlled low-speed input signals are inputted; wherein a plurality of ON/OFF information data inputted via said indirect input interface circuits are serially transmitted to said RAM memory, and a filter constant of the control constant stored in said nonvolatile memory is serially transmitted to said constant setting registers.