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US 12,638,010 B2Granted
Motor-driven compressor for vehicle
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorsHiroki Ishihara, Katsuya Usami, Atsushi Oshima, Satoshi Okada, Yoshifumi Tada, Takuya Sagawa
Life of this patent
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Abstract
A motor-driven compressor for a vehicle includes a control device and a detection circuit. The detection circuit includes an AD conversion circuit. The AD conversion circuit converts an on-voltage from an analog signal to a digital signal. The control device is configured to determine that a battery is in an overvoltage state and stop the motor-driven compressor for the vehicle when a value of the on-voltage detected from the digital signal is larger than an overvoltage determination threshold value.
Claims7
A motor-driven compressor for a vehicle, the motor-driven compressor comprising:
- a high-voltage circuit connected to a high-voltage battery and configured to operate based on power supplied from the high-voltage battery, the high-voltage circuit including:
- an electric motor,
- an inverter configured to supply AC power to the electric motor, and
- processing circuitry configured to control the inverter;
- a compression portion configured to be driven by the electric motor;
- and
- a low-voltage circuit connected to a low-voltage battery and configured to operate based on power supplied from the low-voltage battery, the low-voltage circuit including a connection line connected to the low-voltage battery, and a detection circuit connected to the connection line and configured to detect an on-voltage received from the low-voltage battery via a start switch of the vehicle,
- wherein the detection circuit includes:
- a power supply terminal electrically connected to the low-voltage battery via the connection line,
- a signal input terminal configured to receive a wake-up signal from an upper-rank control device,
- an AD conversion circuit configured to convert the on-voltage received from the low-voltage battery from an analog signal to a digital signal,
- a switching element located at an on-voltage input side of the AD conversion circuit and connected to the power supply terminal, and
- a switch that connects the switching element to the signal input terminal, the switch being configured to turn on the switching element when receiving the wake-up signal from the signal input terminal,
- wherein the processing circuitry is configured to determine that the low-voltage battery is in an overvoltage state and stop the motor-driven compressor for the vehicle when a value of the on-voltage detected from the digital signal is larger than an overvoltage determination threshold value, and
- wherein a connection between the low-voltage battery, the connection line, the power supply terminal, and the switching element is separate from a connection between the switching element, the switch, the signal input terminal, and the upper-rank control device.
12 more elements
A motor-driven compressor for a vehicle, the motor-driven compressor comprising:
- a high-voltage circuit connected to a high-voltage battery and configured to operate based on power supplied from the high-voltage battery, the high-voltage circuit including:
- an electric motor,
- an inverter configured to supply AC power to the electric motor, and
- processing circuitry configured to control the inverter;
- a compression portion configured to be driven by the electric motor;
- and
- a low-voltage circuit connected to a low-voltage battery and configured to operate based on power supplied from the low-voltage battery, the low-voltage circuit including a connection line connected to the low-voltage battery, and a detection circuit connected to the connection line and configured to detect an on-voltage received from the low-voltage battery via a start switch of the vehicle,
- wherein the detection circuit includes:
- a power supply terminal electrically connected to the low-voltage battery via the connection line,
- a signal input terminal configured to receive a wake-up signal from an upper-rank control device,
- an AD conversion circuit configured to convert the on-voltage received from the low-voltage battery from an analog signal to a digital signal,
- a switching element located at an on-voltage input side of the AD conversion circuit and connected to the power supply terminal, and
- a switch that connects the switching element to the signal input terminal, the switch being configured to turn on the switching element when receiving the wake-up signal from the signal input terminal,
- wherein the processing circuitry is configured to determine that the low-voltage battery is in a low-voltage state and stop the motor-driven compressor for the vehicle when a value of the on-voltage detected from the digital signal is smaller than a low-voltage determination threshold value, and
- wherein a connection between the low-voltage battery, the connection line, the power supply terminal, and the switching element is separate from a connection between the switching element, the switch, the signal input terminal, and the upper-rank control device.
12 more elements
Dependencies are inferred from the claim text.