VEHICLE POWER SUPPLY CONTROL DEVICE

摘要

A power supply control device detects current that actually flowed through each load and a duty ratio of the current using a current detection unit and a duty ratio detection unit, and calculates an actual supply power value of each load using a power data calculation unit. A PWM control duty ratio is calculated by a duty ratio correction value calculation unit such that the calculated actual supply power value corresponds to a target power value of each load and it is set as the duty ratio of the PWM control by a PWM duty ratio control unit. Thus, even if resistance characteristics of each load or a wire harness connected to each load are varied by changes over time or environment, the PWM control duty ratio can be corrected according to the varied resistance characteristics, and power of the target power value is supplied to the load.

主权项

1. A power supply control device for controlling power supplied from a power supply to loads of a vehicle per unit time by PWM control, comprising:
a power data calculation unit that is configured to calculate an actual supply power value of each of the loads per the unit time from a current value that flowed through each of the loads and its duty ratio and a voltage of the power supply for each of the loads of the vehicle respectively; a duty ratio correction value calculation unit that is configured to calculate a duty ratio of the PWM control to match the actual supply power value with a target power value supplied from the power supply to each of the loads per unit time by the PWM control for each load respectively; and a duty ratio control unit that is configured to correct the duty ratio of the PWM control to the duty ratio calculated by the duty ratio correction value calculation unit for each load respectively.