US 10,707,801 B2Granted

Electric vehicle drive system and electric vehicle driving method

AssigneeHuawei Technologies Co., Ltd.

InventorsJie Yi, Jie Tang

Life of this patent

Estimating the term…

Loading patent…

Abstract

An electric vehicle drive system includes a power battery, a drive, a motor, a detection module, a torque reference module, and a controller, and the drive includes a filtering module, a first conversion module, a first capacitor, and a second conversion module. A positive electrode of the power battery is connected to an input end of the filtering module, and a first output end of the filtering module is connected to an alternating current end of the first conversion module. One end of the first capacitor is separately connected to direct current input ends of the first conversion module and the second conversion module, and the other end of the first capacitor is separately connected to direct current output ends of the first conversion module and the second conversion module and a negative electrode of the power battery.

Claims14

Dependent claims

An electric vehicle drive system, comprising:

a power battery;
a drive;
a motor;
a detection module;
a torque reference module;
an input switching module and a first output switching module;
and
a controller,
wherein the drive comprises a filtering module, a first conversion module, a first capacitor, and a second conversion module;
a positive electrode of the power battery is connected to an input end of the filtering module, a first output end of the filtering module is connected to an alternating current end of the first conversion module, and a second output end of the filtering module is connected to a negative electrode of the power battery;
a direct current input end of the first conversion module is separately connected to one end of the first capacitor and a direct current input end of the second conversion module, and the other end of the first capacitor, a direct current output end of the first conversion module, and a direct current output end of the second conversion module are separately connected to the negative electrode of the power battery;
and
an alternating current end of the second conversion module is connected to an input end of the motor, an output end of the motor is connected to a first input end of the detection module, a second input end of the detection module is connected to the one end of the first capacitor, a third input end of the detection module is connected to the positive electrode of the power battery, an output end of the detection module and an output end of the torque reference module are separately connected to an input end of the controller, and an output end of the controller is separately connected to a control end of the first conversion module and a control end of the second conversion module;
wherein a first input end of the input switching module is connected to the positive electrode of the power battery, a first output end of the input switching module is connected to the input end of the filtering module, a second output end of the input switching module is separately connected to the direct current input end of the first conversion module, the one end of the first capacitor, and the direct current input end of the second conversion module;
a first input end of the first output switching module is connected to the alternating current end of the first conversion module, and an output end of the first output switching module is connected to the input end of the motor;
and
the output end of the controller is separately connected to a second input end of the input switching module and a second input end of the first output switching module.

14 more elements

An electric vehicle driving method, comprises:

obtaining, by a torque reference module, reference torque of a motor, and obtaining, by the detection module, a voltage of the power battery, a rotation speed of the motor, a voltage of the first capacitor, a stator current of the motor, and a rotor rotation angle of the motor;
calculating, by a controller, a demand voltage of the motor based on the reference torque of the motor and the rotation speed of the motor;
when the demand voltage is greater than the voltage of the power battery, generating, by the controller, a first pulse-width modulation (PWM) signal based on the voltage of the power battery and the demand voltage, and sending the first PWM signal to the first conversion module, so as to control, by using the first conversion module, the filtering module to boost the voltage of the first capacitor to the demand voltage;
and
generating, by the controller, a second PWM signal based on the reference torque of the motor, the rotation speed of the motor, the voltage of the first capacitor, the stator current of the motor, and the rotor rotation angle of the motor, and sending the second PWM signal to the second conversion module, so as to control the second conversion module to invert, into an alternating current, a direct current that is input by the first capacitor, and transfer the alternating current to the motor to drive the motor to speed up.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/225,209Filed 19 Dec 2018 · continuation
Priority: CN 2016 1 045561522 Jun 2016
Published: US 2019/0123676 A125 Apr 2019
Granted: 7 Jul 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

B60L 50/51
Using propulsion power supplied by batteries or fuel cells: characterised by AC-motors
B60L 15/2045
For control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed: for…
B60L 50/50
Electric propulsion with power supplied within the vehicle: using propulsion power supplied by batteries or fuel cells
B60L 50/60
Using propulsion power supplied by batteries or fuel cells: using power supplied by batteries