IN-VEHICLE ECU

摘要

An in-vehicle ECU is provided that minimizes electric power consumption while an internal microcomputer does not need to operate. Furthermore, a power supply IC stops supplying an operation power from a power supply output unit in a pre-OFF mode, and restarts the supply of the operation power to the microcomputer when an OR gate output signal is “H”. A CPU of the microcomputer, if, at the time of the restart of the operation power after the pre-OFF mode was set, a predetermined time has elapsed since the pre-OFF mode was set, without any change in an activation factor, which is to serve as a factor for activating the microcomputer, based on whether or not there is a temporal change in external input information, outputs a power supply control signal of “H” in order to execute a power supply stop operation for stopping supplying electric power to ECUs subjected to power supply control.

主权项

1. An in-vehicle ECU configured to stop supplying electric power to at least one ECU subjected to power supply control, the in-vehicle ECU comprising:
a microcomputer that operates when supplied with an operation power, and is set to a pre-OFF mode if a predetermined condition is satisfied during the operation; and a power supply unit that supplies the operation power to the microcomputer when a normal mode is set, and stops the supply of the operation power to the microcomputer when the pre-OFF mode is set, wherein the power supply unit includes a counter circuit that counts down a predetermined time when the pre-OFF mode is set, and the power supply unit restarts the supply of the operation power to the microcomputer when the predetermined time has elapsed, and wherein the microcomputer executes a power supply stop operation for stopping supplying electric power to the at least one ECU subjected to power supply control if, at the time of the restart of the supply of the operation power after the pre-OFF mode was set, the predetermined time has elapsed since the pre-OFF mode was set, without any change in an activation factor, wherein the activation factor serves as a factor for activating the microcomputer.