Wheel stability control based on the moment of an electrical motor
First Claim
1. A wheel stability control system for a vehicle, the system comprising:
- a power system comprising an electric motor having electrical characteristics, the power system configured to determine an angular speed, an input current, an input voltage, and a phase angle between the input current and the input voltage to the electric motor;
an electronic control unit (ECU) including a computer readable, non-transitory memory, the memory storing information including an optimal acceleration and deceleration curve of the vehicle and the electrical characteristics of the electric motor, wherein the ECU is configured to;
calculate an electrical moment of the electric motor based on the angular speed, the input current, the input voltage, and the phase angle of the electric motor provided by the power system and on the electrical characteristics of the electric motor, determine the acceleration or deceleration of the electric motor from the angular speed of the electric motor, determine the optimal acceleration and the optimal deceleration of the electric motor based on the angular speed of the electric motor and based on the optimal acceleration and deceleration curve, determine if the acceleration or the deceleration of the electric motor exceeds the optimal acceleration or the optimal deceleration of the electric motor, when the acceleration or the deceleration of the electric motor exceeds the optimal acceleration or the optimal deceleration, adjust the electrical moment of the electric motor until the acceleration or the deceleration of the electric motor matches the optimal acceleration or the optimal deceleration, and an acceleration sensor that determines an acceleration of the vehicle and provides a value of the acceleration of the vehicle to the ECU, wherein the ECU adjusts the optimal acceleration and deceleration curve in response to the information from the acceleration sensor.
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Accused Products
Abstract
A wheel stability control system for an electric vehicle including an electric motor, a drive inverter, and an electronic control unit (ECU) including a computer readable, non-transitory memory (memory) and an electronic processing unit (EPU). The memory stores information including an optimal acceleration and deceleration curve and the electrical characteristics of the electric motor. The EPU calculates the electrical moment of the electric motor from inputs from the drive inverter and the electrical characteristics of the electric motor. The ECU compares the electrical moment and the angular speed of the motor with the optimal acceleration and deceleration curve, and if the acceleration or deceleration of the electric motor is out of a predetermined range when compared to the optimal acceleration and the optimal deceleration, it reduces the electrical moment applied by the electric motor.
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Citations
18 Claims
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1. A wheel stability control system for a vehicle, the system comprising:
- a power system comprising an electric motor having electrical characteristics, the power system configured to determine an angular speed, an input current, an input voltage, and a phase angle between the input current and the input voltage to the electric motor;
an electronic control unit (ECU) including a computer readable, non-transitory memory, the memory storing information including an optimal acceleration and deceleration curve of the vehicle and the electrical characteristics of the electric motor, wherein the ECU is configured to;
calculate an electrical moment of the electric motor based on the angular speed, the input current, the input voltage, and the phase angle of the electric motor provided by the power system and on the electrical characteristics of the electric motor, determine the acceleration or deceleration of the electric motor from the angular speed of the electric motor, determine the optimal acceleration and the optimal deceleration of the electric motor based on the angular speed of the electric motor and based on the optimal acceleration and deceleration curve, determine if the acceleration or the deceleration of the electric motor exceeds the optimal acceleration or the optimal deceleration of the electric motor, when the acceleration or the deceleration of the electric motor exceeds the optimal acceleration or the optimal deceleration, adjust the electrical moment of the electric motor until the acceleration or the deceleration of the electric motor matches the optimal acceleration or the optimal deceleration, and an acceleration sensor that determines an acceleration of the vehicle and provides a value of the acceleration of the vehicle to the ECU, wherein the ECU adjusts the optimal acceleration and deceleration curve in response to the information from the acceleration sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a power system comprising an electric motor having electrical characteristics, the power system configured to determine an angular speed, an input current, an input voltage, and a phase angle between the input current and the input voltage to the electric motor;
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11. A method for controlling drive wheel stability in a vehicle powered by an electric motor, the method comprising:
- determining electrical characteristics of the electric motor;
determining an input current, an input voltage, a phase angle between the input voltage and the input current, and an angular speed of the electric motor; and
storing information about the input current, the input voltage, the phase angle, the angular speed, and the electrical characteristics of the electric motor into a computer readable, non-transitory memory for use by an electronic control unit (ECU) to calculate an electrical moment of the electric motor based on the input current, the input voltage, the phase angle, the angular speed, and the electrical characteristics of the electric motor, determine an acceleration or a deceleration of the electric motor based on the angular speed of the electric motor, determine an optimal acceleration or optimal deceleration of the electric motor based on an optimal acceleration and deceleration curve and the angular speed of the electric motor, compare the acceleration or deceleration of the electric motor to the optimal acceleration or optimal deceleration, when the acceleration or the deceleration of the electric motor exceeds the optimal acceleration or the optimal deceleration, adjust the electrical moment of the electric motor to bring the acceleration or the deceleration to the optimal acceleration or the optimal deceleration, and determining an acceleration of the vehicle by using a vehicle acceleration sensor and transmitting information from the vehicle acceleration sensor to the ECU, wherein the ECU adjusts the optimal acceleration and deceleration curve in response to the vehicle acceleration sensor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
- determining electrical characteristics of the electric motor;
Specification