Motor driving system and motor driving method

Patent metadata

Field	Value
Publication number	US-10819266-B2
Application number	US-201816046349-A
Country	US
Kind code	B2
Filing date	Jul 26, 2018
Priority date	Sep 7, 2017
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

Provided are a motor angle detector for detecting a motor angle, a current detector for detecting a motor current value to drive a motor, a vehicle inclination angle detector for detecting a vehicle inclination angle, a motor control circuit for outputting a control signal to control the driving of the motor, and a storage apparatus. The storage apparatus stores data obtained by associating the motor current value, a setting value in the motor control circuit for outputting the control signal, the vehicle inclination angle, and the motor angle at a first time with each other, and the motor control circuit controls the driving of the motor on the basis of information of the motor current value and the vehicle inclination angle at a second time and the data at the first time.

First claim

What is claimed is:

1. A motor driving system comprising:
a motor angle detection circuit that receives a motor angle signal to detect a motor angle that is the angle of a rotor of a motor;
a current detection circuit that receives a motor current signal to detect a motor current value that is the value of a current for driving the motor;
a mobile object inclination angle detection circuit that receives an inclination angle signal to detect a mobile object inclination angle that is the inclination angle of a mobile object that moves by driving the motor;
a motor control circuit that outputs a control signal for controlling the driving of the motor;
a storage apparatus; and
a mobile object speed detection circuit that detects a mobile object speed that is the speed of the mobile object,
wherein the storage apparatus stores data obtained by associating the motor current value, a setting value in the motor control circuit for outputting the control signal, the mobile object inclination angle, and the motor angle at a first time with each other, and
wherein the motor control circuit controls the driving of the motor based on information of the motor current value and the mobile object inclination angle at a second time and the data at the first time,
wherein the storage apparatus stores data obtained by associating the motor current value, the setting value, the mobile object inclination angle, the mobile object speed, and the motor angle at the first time with each other,
wherein the motor control circuit controls the driving of the motor based on information of the motor current value, the mobile object inclination angle, and the mobile object speed at the second time and the data at the first time, and
wherein in a case where a difference between the mobile object speed as a result of the control of the motor driving at the second time and the mobile object speed at the second time is equal to or larger than a predetermined value, the motor control circuit updates the data stored in the storage apparatus based on information of the result of the control of the motor driving at the second time.

2. The motor driving system according to claim 1 , further comprising a failure detection circuit that detects a failure of the motor angle detection circuit to output a failure detection signal,
wherein the first time is a time before outputting the failure detection signal, and
wherein the second time is a time after outputting the failure detection signal.

3. The motor driving system according to claim 1 , further comprising an acceleration/deceleration request detection circuit that detects acceleration/deceleration request information that is information related to a degree of a request of acceleration/deceleration by a user for the mobile object,
wherein the storage apparatus stores data obtained by associating the motor current value, the setting value, the mobile object inclination angle, the acceleration/deceleration request information, and the motor angle at the first time with each other, and
wherein the motor control circuit controls the driving of the motor based on the motor current value, the mobile object inclination angle, and the acceleration/deceleration request information at the second time and the data at the first time.

4. The motor driving system according to claim 3 , wherein the acceleration/deceleration request information is generated based on an input of an accelerator or a brake provided in the mobile object.

5. A motor driving method comprising the steps of:
obtaining a motor angle that is the angle of a rotor of a motor mounted in a mobile object;
obtaining a motor current value that is the value of a current for driving the motor;
obtaining information of a mobile object inclination angle that is the inclination angle of the mobile object;
generating data obtained by associating the motor current value, a signal value for controlling the driving of the motor, the mobile object inclination angle, and the motor angle at a first time with each other;
storing the associated data in a storage apparatus;
controlling the driving of the motor based on information of the motor current value and the mobile object inclination angle at a second time and the data at the first time;
detecting a mobile object speed that is the speed of the mobile object;
generating data obtained by associating the motor current value, a setting value for controlling the driving of the motor, the mobile object inclination angle, the mobile object speed, and the motor angle at the first time with each other to be stored in the storage apparatus; and
controlling the driving of the motor based on information of the motor current value, the mobile object inclination angle, and the mobile object speed at the second time and the data at the first time,
wherein in a case where a difference between the mobile object speed as a result of the control of the motor driving at the second time and the mobile object speed at the second time is equal to or larger than a predetermined value, the data stored in the storage apparatus is updated based on information of the result of the control of the motor driving at the second time.

6. The motor driving method according to claim 5 , further comprising the step of detecting a failure in which the motor angle cannot be obtained,
wherein the first time is a time before detecting the failure, and
wherein the second time is a time after detecting the failure.

7. The motor driving method according to claim 5 , further comprising the steps of:
detecting acceleration/deceleration request information that is information related to a degree of a request of acceleration/deceleration by a user for the mobile object;
generating data obtained by associating the motor current value, a setting value for controlling the driving the motor, the mobile object inclination angle, the acceleration/deceleration request information, and the motor angle at the first time with each other to be stored in the storage apparatus; and
controlling the driving of the motor based on the motor current value, the mobile object inclination angle, and the acceleration/deceleration request information at the second time and the data at the first time.

8. The motor driving method according to claim 7 , wherein the acceleration/deceleration request information is generated based on an input of an accelerator or a brake provided in the mobile object.

Assignees

• Renesas Electronics Corp

Inventors

• Yasuda Yusuke
• Takemura Narihira

Classifications

• B60L2240/642

  Slope of road · CPC title

• B60L2260/46

  by self learning · CPC title

• B60L15/20 Primary

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• B60Y2200/90

  Vehicles comprising electric prime movers · CPC title

• B60W2510/08

  Electric propulsion units · CPC title