On-board air conditioner control device, and vehicle

Patent metadata

Field	Value
Publication number	US-11331981-B2
Application number	US-201917056596-A
Country	US
Kind code	B2
Filing date	Apr 17, 2019
Priority date	Jun 12, 2018
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

This on-board air conditioner control device comprises: a PTC heater which is contained in a high-voltage circuit and generates heat by means of power supplied from a high-voltage battery; a micro-controller which is contained in a low-voltage circuit and controls the power supplied to the PTC heater from the high-voltage battery; a current detection sensor which is contained in the high-voltage circuit and outputs a voltage signal indicating a value for the current flowing through the PTC heater; a V/f conversion unit which is contained in the high-voltage circuit and converts the voltage signal outputted by the current detection sensor to a frequency signal; and a digital isolator which transmits the frequency signal to the micro-controller while preserving electrical insulation between the V/f conversion unit and the micro-controller.

First claim

The invention claimed is:

1. A vehicle-mounted air conditioner control device comprising:
a heater element that is included in a high-voltage system circuit and generates heat by power supplied from a high-voltage battery;
a microcontroller that is included in a low-voltage system circuit and controls the power supplied from the high-voltage battery to the heater element;
a current detection sensor that is included in the high-voltage system circuit and outputs a voltage signal indicating a value of a current flowing in the heater element;
a V/f conversion unit for current detection that is included in the high-voltage system circuit and converts the voltage signal output from the current detection sensor into a frequency signal; and
a digital isolator for current detection that transmits the frequency signal to the microcontroller while maintaining electrical insulation between the V/f conversion unit for current detection and the microcontroller.

2. The vehicle-mounted air conditioner control device according to claim 1 ,
wherein the V/f conversion unit for current detection includes
a silicon oscillator having a setting terminal and an output terminal, and
the silicon oscillator outputs, from the output terminal, the frequency signal having a frequency corresponding to a current output from the setting terminal.

3. The vehicle-mounted air conditioner control device according to claim 2 , further comprising:
a high-voltage-side voltage sensor that is included in the high-voltage system circuit and outputs a voltage signal according to an input voltage from the high-voltage battery;
a V/f conversion unit for high-voltage-side voltage detection that is included in the high-voltage system circuit and converts the voltage signal output from the high-voltage-side voltage sensor into a frequency signal; and
a digital isolator for high-voltage-side voltage detection that transmits the frequency signal to the microcontroller while maintaining electrical insulation between the V/f conversion unit for high-voltage-side voltage detection and the microcontroller.

4. A vehicle comprising:
the vehicle-mounted air conditioner control device according to claim 2 .

5. The vehicle-mounted air conditioner control device according to claim 1 , further comprising:
a high-voltage-side voltage sensor that is included in the high-voltage system circuit and outputs a voltage signal according to an input voltage from the high-voltage battery;
a V/f conversion unit for high-voltage-side voltage detection that is included in the high-voltage system circuit and converts the voltage signal output from the high-voltage-side voltage sensor into a frequency signal; and
a digital isolator for high-voltage-side voltage detection that transmits the frequency signal to the microcontroller while maintaining electrical insulation between the V/f conversion unit for high-voltage-side voltage detection and the microcontroller.

6. A vehicle comprising:
the vehicle-mounted air conditioner control device according to claim 5 .

7. A vehicle comprising:
the vehicle-mounted air conditioner control device according to claim 1 .

8. A vehicle-mounted air conditioner control device comprising:
a motor that is included in a high-voltage system circuit and is driven with power supplied front a high-voltage battery;
a microcontroller that is included in a low-voltage system circuit and controls the power supplied from the high-voltage battery to the motor;
a current detection sensor that is included in the high-voltage system circuit and outputs a voltage signal indicating a value of a current flowing in the motor;
a V/f conversion unit for current detection that is included in the high-voltage system circuit and converts the voltage signal output from the current detection sensor into a frequency signal; and
a digital isolator for current detection that transmits the frequency signal to the microcontroller while maintaining electrical insulation between the V/f conversion unit for current detection and the microcontroller.

9. A vehicle comprising:
the vehicle-mounted air conditioner control device according to claim 8 .

Assignees

• Mitsubishi Heavy Ind Thermal Systems Ltd

Inventors

• Sato Hidetaka
• Osaki Tomoyasu
• Nagasaka Keiji
• Kojima Ryota

Classifications

• B60H2001/2256

  related to the operation of the heater itself, e.g. flame detection or overheating · CPC title

• B60H1/00428

  electric · CPC title

• B60H1/2215 Primary

  the heat being derived from electric heaters · CPC title

• B60H1/2218 Primary

  controlling the operation of electric heaters · CPC title

• H05B3/00

  Ohmic-resistance heating · CPC title