Boost converter control apparatus

1. A boost converter control apparatus which is configured to control a boost converter in a power supply system,

the power supply system comprising:

a DC (direct current) power supply having power supply voltage (VB);

the boost converter including a switching device, the boost converter being configured to boost the power supply voltage and output the boosted power supply voltage to a loading apparatus by predetermined boost control including switching of a switching state of the switching device; and

a voltage sensor which is configured to detect output voltage (VH) of the boost converter,

the boost converter control apparatus comprising:

a target value setting device that is configured to set a target value (VHtg) of the output voltage such that a loss of the power supply system (Lsys) including the DC power supply, the boost converter, and the loading apparatus is minimum;

an intermittent controlling device that is configured to execute repeatedly an intermittent process of the boost control such that the output voltage is maintained in a voltage variation allowable range including the target value (VHtg) which is set in an immediately preceding execution of the boost control based on the detected output voltage;

an average value calculating device that is configured to calculate an average value (VHavg) of the output voltage which is obtained by averaging a plurality of the detected output voltage in the execution period of the intermittent process of the boost control; and

a target value correcting device that is configured to correct the set target value (VHtg) to reduce a deviation between the calculated average value (VHavg) of the output voltage and the set target value (VHtg) of the output voltage.

2. The boost converter control apparatus according to claim 1 , wherein the boost converter control apparatus further comprising a range setting device that is configured to set the voltage variation allowable range in such a manner that a deviation between the set or corrected target value and an upper limit value of the voltage variation allowable range decreases as the set or corrected target value increases.

3. The boost converter control apparatus according to claim 1 , wherein the average value calculating device that is configured to calculate the average value on the basis of the detected output voltage in at least one unit intermittent process, wherein the unit intermittent process is a process corresponding to a period including an execution period and a stop period of the boost control, which are continuous to each other, in the intermittent process of the boost control is.

4. The boost converter control apparatus according to claim 3 , wherein

the power supply system further comprises a current sensor which is configured to detect current which flows through the DC power supply or the boost converter, and

the boost converter control apparatus further comprises a current correcting device that is configured to correct the detected current in the stop period of the boost control in the one unit intermittent process.

5. The boost converter control apparatus according to claim 1 , wherein the target value setting device that is configured to (1) correct the set target value by adding a value that is less than or equal to the deviation between the calculated average value and the set target value to the set target value when the average value which is previously calculated by the target value setting device is less than the set target value, and (2) correct the set target value by subtracting the value that is less than or equal to the deviation between the calculated average value and the set target value from the set target value when the average value which is previously calculated by the target value setting device is greater than the set target value.

6. The boost converter control apparatus according to claim 1 , wherein the intermittent controlling device that is configured to start the intermittent process of the boost control when a variation width of the output voltage is within a predetermined value.

7. The boost converter control apparatus according to claim 1 , wherein the power supply system is mounted on a vehicle.

8. The boost converter control apparatus according to claim 7 , wherein the vehicle comprises, as a power source of the vehicle, at least one electrical rotating machine which is capable of performing power running and regeneration and which is the loading apparatus.

9. The boost converter control apparatus according to claim 8 , wherein

the vehicle is a hybrid vehicle comprising:

an engine;

a first electrical rotating machine which is capable of performing the power running and the regeneration and which is the loading apparatus;

a differential mechanism comprising a plurality of rotating elements that can differentially rotate with each other, the plurality of rotating elements including a first rotating element which is coupled with the first electrical rotating machine, a second rotating element which is coupled with the engine, and a third rotating element which is coupled with a drive shaft connected to an axle shaft; and

a second electrical rotating machine which is coupled with the drive shaft, which is capable of performing the power running and the regeneration and which is the loading apparatus, and

the intermittent controlling device that is configured to start the intermittent process of the boost control when a difference between an input/output of power from/to the first and second electrical rotating machines is within a predetermined value in a case where one of the first and second electrical rotating machines is in a power-running state and the other is in a regenerative state.