Electric vehicle speed control method
A technology for electric vehicles and vehicle speed control, which is applied in the direction of electric vehicles, control drives, vehicle components, etc., can solve the problems of damage to the motor itself, failure of the driver's accelerator pedal, increased cost and operational complexity, and achieve the goal of improving vehicle safety Effect
Active Publication Date: 2013-02-06
SUZHOU LANSHEN ELECTRONICS CO LTD
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Problems solved by technology
Like the engine, the speed of the motor is not allowed to exceed its maximum speed. The speed of the motor can directly reflect the speed of the vehicle. Excessive speed of the motor not only damages the motor itself, but also does not benefit the driving safety of the vehicle.
[0004] At present, the constant speed cruise control in the control of electric vehicles can stabilize the vehicle speed at a certain speed, but the driver's accelerator pedal will be invalid. If the constant speed cruise control method in traditional vehicles is applied to the speed control of electric vehicles, an additional The hardware device exits the constant speed mode, which increases the cost and operation complexity
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[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0040] see figure 1 As shown, a method for controlling the vehicle speed of an electric vehicle, in which the vehicle controller and the motor controller communicate through the CAN bus. First, the vehicle controller determines the driver's demand torque T at the current moment according to the current driving conditions. req (n), then, determine the drive target torque T at the current moment through the speed control module aim (n), during the operation of the electric vehicle, the motor controller receives the drive target torque T at the current moment aim After (n), the motor actual torque T of the previous moment is fed back to the vehicle controller real (n-1), the actual torque feedback cycle of the motor is 20ms; by controlling the current moment to drive the target torque T aim (n), stabilizing the vehicle speed within t...
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The invention discloses an electric vehicle speed control method which is characterized in that a vehicle control unit is in communication with a motor controller through a CAN (Controller Area Network) bus; at first, the vehicle control unit determines a current-time driver' desired torque according to the current driving condition, and then, a rotational speed control module determines a current-time driving target torque; in the running process of an electric vehicle, the motor controller receives the current-time driving target torque and then feeds the current-time driving target torque back to the motor actual torque at the previous time of the vehicle control unit; and the vehicle speed is enabled to be stable within a highest speed through controlling the current-time driving target torque. The invention designs a software control method which is characterized in that the highest speed of the electric vehicle is controlled within a certain range, if the vehicle speed reaches the set maximum, the driver continues increasing or keeping the accelerator pedal, that is, the highest vehicle speed is kept, and if the accelerator pedal is reduced, the vehicle speed is reduced along with the pedal, so that the damage to a motor due to too high vehicle speed is not caused, and the safety of the vehicle is improved.
Description
technical field [0001] The invention relates to the field of electric vehicle control, in particular to a method for controlling the speed of an electric vehicle. Background technique [0002] With the shortage of oil resources and the aggravation of environmental pollution, electric vehicles have developed rapidly. Electric vehicles use electric motors instead of traditional car engines as the power source of the vehicle, which can save oil and optimize emissions. [0003] In the engine control of transmission vehicles, when the engine speed exceeds its allowable maximum speed, the engine ECU controls the injector to cut off the fuel supply to prevent the engine from overspeeding and causing damage to the body. Like the engine, the speed of the motor is not allowed to exceed its maximum speed. The speed of the motor can directly reflect the speed of the vehicle. Excessive speed of the motor not only damages the motor itself, but also does not benefit the driving safety of ...
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Inventor 耿建涛吴新兵魏长河陆协和方兰兰
Owner SUZHOU LANSHEN ELECTRONICS CO LTD