Heater control apparatus and sensor control system

摘要

A heater control apparatus (1) includes a heater driver (51) which is turned on and off in accordance with a pulse drive signal PS, heater energization control means S33, S39 for outputting the pulse drive signal PS to the heater driver 51 so as to control the supply of electric current to the heater section (4), power supply voltage detection means S30, S35 for detecting a power supply voltage VB of the power supply BT, ideal electric energy obtaining means S31, S37 for obtaining an unit ideal electric energy WAi, actual electric energy calculation means S36 for calculating an unit actual electric energy WA, and duty ratio determination means S38 for determining a duty ratio DT(n+1) of the pulse drive signal PS such that the unit actual electric energy WA(n+1) becomes equal to the unit ideal electric energy WAi(n+1) in the next period T(n+1).

主权项

1. A heater control apparatus configured for controlling a heater section of a sensor, the heater control apparatus comprising:
a heater driver which is turned on and off in accordance with a pulse drive signal composed of an on signal and an off signal appearing alternatingly and which supplies electric power from a power supply to the heater section; heater energization control means for outputting the pulse drive signal to the heater driver so as to control the supply of electric current to the heater section; power supply voltage detection means for detecting a power supply voltage of the power supply; ideal electric energy obtaining means for obtaining a unit ideal electric energy which is an ideal electric energy to be applied to the heater section in respective periods of the pulse drive signal; actual electric energy calculation means for calculating an unit actual electric energy which is an electric energy actually applied to the heater section in the respective periods; and duty ratio determination means for determining a duty ratio of the pulse drive signal based on the unit actual electric energy obtained for the current period and the unit ideal electric energy for the current period such that the unit actual electric energy becomes equal to the unit ideal electric energy in a next period.