US 12,328,085 B2
Electronic control device
Atsushi Matsuoka, Hitachinaka (JP)
Assigned to HITACHI ASTEMO, LTD., Hitachinaka (JP)
Appl. No. 18/044,485
Filed by HITACHI ASTEMO, LTD., Hitachinaka (JP)
PCT Filed Sep. 10, 2021, PCT No. PCT/JP2021/033308
§ 371(c)(1), (2) Date Mar. 8, 2023,
PCT Pub. No. WO2022/059615, PCT Pub. Date Mar. 24, 2022.
Claims priority of application No. 2020-156738 (JP), filed on Sep. 17, 2020.
Prior Publication US 2023/0327598 A1, Oct. 12, 2023
Int. Cl. H02P 29/02 (2016.01); B62D 5/04 (2006.01); H02P 25/22 (2006.01)
CPC H02P 29/02 (2013.01) [H02P 25/22 (2013.01); B62D 5/046 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An electronic control device comprising:
a first positive electrode connector and a first negative electrode connector connected to a first power source;
a second positive electrode connector and a second negative electrode connector connected to a second power source;
a first inverter connected to the first positive electrode connector and the first negative electrode connector and energizing a first winding set of an electric motor to drive the first winding set of the electric motor;
a second inverter connected to the second positive electrode connector and the second negative electrode connector and energizing a second winding set of the electric motor to drive the second winding set of the electric motor;
a ground portion connected to the first negative electrode connector and the second negative electrode connector;
a sensor portion provided between the first negative electrode connector and the ground portion or between the second negative electrode connector and the ground portion;
a current detection circuit capable of detecting a current flowing between the first negative electrode connector and the second negative electrode connector via the ground portion based on an output signal of the sensor portion; and
a microcomputer including:
a first microcomputer connected to the first positive electrode connector and the first negative electrode connector and controlling an output of the first inverter, and
a second microcomputer connected to the second positive electrode connector and the second negative electrode connector, and controlling an output of the second inverter,
wherein the first microcomputer and the second microcomputer determine whether an abnormality is generated in a resistance value of a first ground harness from the first negative electrode connector to the first power source or a resistance value of a second ground harness from the second negative electrode connector to the second power source based on an output voltage of the current detection circuit;
after it has been determined that the abnormality is generated, the first microcomputer and the second microcomputer start estimating a rise temperature inside the electronic control device based on an output voltage of the current detection circuit; and
the first microcomputer starts restriction of a current output from the first inverter based on the rise temperature, or the second microcomputer starts restriction of a current output from the second inverter based on the rise temperature.