On-vehicle electronic controller
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKohji Hashimoto, Katsuya Nakamoto
Life of this patent
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Abstract
The invention relates to an on-vehicle electronic controller and intends to lighten the burden on a microprocessor in processing input and output of the controller and miniaturize and standardize the controller. A plurality of ON/OFF data inputted from indirect input interface circuits are transmitted to a RAM memory via a variable filter circuit and a two-way serial communication circuit. A filter constant of the variable filter circuit is set by a constant setting register, and a filter constant stored in the nonvolatile memory is stored in the constant setting register via two-way serial communication circuit.
Claims9
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/second serial-parallel converter 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.
Dependencies are inferred from the claim text.