Abstract: When at least one of motor generators is not under normal control and where the MG1 temperature is less than an upper limit value, an ECU is configured to perform an inverter-less running control. In the inverter-less running control, an inverter is brought into a gate shutoff state and an engine is driven to cause the motor generator to generate a counter-electromotive voltage which consequently produces a counter-electromotive torque. During the inverter-less running control, the ECU makes a voltage difference between the counter-electromotive voltage and the voltage of a power line connecting a converter and an inverter when the MG1 temperature is equal to or greater than a predetermined value smaller than the voltage difference when the MG1 temperature is less than the predetermined value.

Abstract: When at least one of motor generators is not under normal control and where the MG1 temperature is less than an upper limit value, an ECU is configured to perform an inverter-less running control. In the inverter-less running control, an inverter is brought into a gate shutoff state and an engine is driven to cause the motor generator to generate a counter-electromotive voltage which consequently produces a counter-electromotive torque. During the inverter-less running control, the ECU makes a voltage difference between the counter-electromotive voltage and the voltage of a power line connecting a converter and an inverter when the MG1 temperature is equal to or greater than a predetermined value smaller than the voltage difference when the MG1 temperature is less than the predetermined value.

Abstract: In a signal processing device, a 3-beam TE signal generation circuit generates a tracking error signal by a 3-beam method (3-beam tracking error signal), and a DPD TE signal generation circuit generates a tracking error signal by a DPD method (DPD tracking error signal). A TE signal variation detection circuit detects a variation in 3-beam tracking error signal. A TE signal generation method switch circuit selects and outputs the 3-beam tracking error signal initially, and if the TE signal variation detection circuit detects a variation, selects and outputs the DPD tracking error signal.