ON-VEHICLE CONTROLLER AND PROGRAM

To prevent a regenerative current from flowing into a switch element subjected to short circuit failure.SOLUTION: An on-vehicle controller includes: a first inverter; a second inverter; and a voltage converter for raising or lowering an operation voltage of one of the first inverter and the second inverter by opening/closing control of a switch to supply the same as an operation voltage of the other inverter. The voltage converter includes: a reference potential line; a low potential side switch connected between the reference potential line and a high potential side power supply line of the second inverter; and a high potential side switch connected between a high potential side power supply line of the first inverter and the high potential side power supply line of the second inverter. The on-vehicle controller also includes: a detection unit for detecting short circuit failure of the low potential side switch; and a control unit for performing phase short-circuit control for short-circuiting at least one of the plurality of low potential side switches or the plurality of high potential side switches of the second inverter when the detection unit detects short-circuit failure of the low potential side switch.SELECTED DRAWING: Figure 1 【課題】短絡故障したスイッチ素子に回生電流が流れ込むことを抑止すること。【解決手段】車載制御装置は、第１インバータと、第２インバータと、第１インバータと第２インバータとのうち一方のインバータの動作電圧をスイッチの開閉制御によって昇圧又は降圧して他方のインバータの動作電圧として供給する電圧変換部と、を備えた車載制御装置において、電圧変換部は、基準電位線と、基準電位線と第２インバータの高電位側電源線との間に接続される低電位側スイッチと、第１インバータの高電位側電源線と第２インバータの高電位側電源線との間に接続される高電位側スイッチと、を備え、低電位側スイッチの短絡故障を検出する検出部と、検出部が低電位側スイッチの短絡故障を検出した場合に、第２インバータの複数の低電位側スイッチ又は複数の高電位側スイッチの少なくとも一方を短絡させる相短絡制御を行う制御部と、を備える。【選択図】図１