Exhaust gas energy recovery device

An exhaust gas energy recovery device, comprising:

• a generator driven by a turbine configured to rotate by an exhaust gas of an engine;
• a first terminal for being connected to a first power storage device;
• a second terminal for being connected to a second power storage device;
• a first diode and a second diode connected to an output of the generator;
• a first capacitor connected in parallel to the first diode and the second diode;
• a third diode connected in series to the second terminal;
• a second capacitor connected in parallel to the first terminal;
• a fourth diode connected in parallel to the second capacitor;
• a reactor provided between a cathode of the fourth diode and one end of the second capacitor;
• a voltmeter configured to measure a voltage between both ends of the first capacitor;
• a switching element provided between one end of the first capacitor and one end of the reactor;
• and
• a controller configured to control the switching element, wherein
• an anode of the first diode and a cathode of the second diode are connected to each other and are connected to the output of the generator,
• a cathode of the first diode is connected to the one end of the first capacitor,
• an anode of the second diode is connected to another end of the first capacitor,
• a cathode of the third diode is connected to the second terminal,
• an anode of the third diode is connected to the one end of the first capacitor,
• the second terminal and the third diode are connected in parallel to the first capacitor, and
• the controller is configured to
• control the switching element to be in an ON state in a case where the voltage between both ends of the first capacitor measured by the voltmeter is lower than a first voltage that is a voltage able to be supplied to the first power storage device,
• control the switching element to be in an OFF state in a case where the voltage between both ends of the first capacitor measured by the voltmeter is higher than a second voltage that is a voltage able to charge the second power storage device, and
• perform pulse width modulation control for the switching element in a case where the voltage between both ends of the first capacitor measured by the voltmeter is equal to or higher than the first voltage and equal to or lower than the second voltage.