56 results about "Yaw stability control" patented technology

A system and method of controlling an automotive vehicle with a yaw stability control system and a trailer comprises determining a presence of a trailer, changing a side slip angle parameter threshold of the vehicle to a modified side slip parameter in response to the trailer signal, and controlling the yaw stability control system in response to the modified side slip parameter.

The present invention is a method and system to control regenerative braking during the operation of a yaw stability control system. The method and system use feedback control algorithms to monitor and dynamically modify regenerative and non-regenerative braking. The controller can use a simple proportional-integral-derivative feedback controller. A vehicle yaw stability control system can determine if a vehicle is experiencing an oversteer or understeer condition. The controller compares actual brake balance to a desired brake balance. The controller determines if the front axle wheels are overbraked relative to the rear axle wheels or if the rear axle wheels are overbraked relative to the front axle wheels as compared to the desired brake balance. The controller can adjust regenerative braking and non-regenerative braking levels according to the determinations.

An enhanced stability control system (200) for a vehicle includes a vehicle status sensor that generates a sensor signal. A driver input sensor that generates an input signal. A controller (214) may disable normal yaw stability control operation and enable body-force-disturbance (BFD) yaw stability control (YSC) operation, which includes at least partially reducing response functions of the normal yaw stability control associated with the input signal, in response to the sensor signal and performing BFD-YSC functions to achieve desired control performance upon the detection of BFD reception. The controller (214) may also or alternatively compare the sensor signal to a threshold and detect an improperly functioning / inoperative vehicle status sensor. The controller (214) disregards information associated with the improperly functioning / inoperative vehicle status sensor, and continues to perform enhanced yaw stability control operations.

A yaw stability control system (18) is enhanced to include roll stability control function for an automotive vehicle and includes a plurality of sensors (28–39) sensing the dynamic conditions of the vehicle. The sensors may include a speed sensor (20), a lateral acceleration sensor (32), a yaw rate sensor (28) and a longitudinal acceleration sensor (36). The controller (26) is coupled to the speed sensor (20), the lateral acceleration sensor (32), the yaw rate sensor (28) and a longitudinal acceleration sensor (36). The controller (26) generates both a yaw stability feedback control signal and a roll stability feedback control signal. The priority of achieving yaw stability control or roll stability control is determined through priority determination logic. If a potential rollover event is detected, the roll stability control will take the priority. The controller for roll stability control function determines a roll angle of the vehicle from the lateral acceleration sensor signal and calculates the feedback control signal based on the roll angle.

The invention discloses an integrated control method for distributed control of an electric automobile. The integrated control method comprises the following steps of according to automobile speed, a steering wheel rotating angle and a steering wheel rotating angular speed, obtaining an expected yaw angular speed and an expected mass center sideslip angle by a signal processing layer by referring to a module; in an integrated control layer, according to the actual value of the yaw angular speed and the expected yaw angular speed, deciding a rear wheel additional yaw torque required for realizing control of the stability of the automobile; according to the actual valve of the mass center sideslip angle and the expected mass center sideslip angle, deciding the front wheel additional rotating angle required for realizing control of the stability of the automobile; in a control distribution layer, according to a target driving torque of a driver and the rear wheel additional yaw torque, reasonably distributing four-wheel driving force, and according to a target front wheel rotating angle of the driver and the front wheel additional rotating angle, correcting the front wheel rotating angle; and controlling the yaw stability by an executing layer through a hub motor. The integrated control method disclosed by the invention has the characteristics that the handling safety stability of the automobile is high, and the steering comfortability of the driver is improved.

The invention discloses an automobile body stability control system for an electric automobile. A hierarchical control structure is adopted for the system. An upper layer controller aims at achieving yaw stability control, wherein the yawing moment required in the whole automobile movement process needs to be calculated, required signals are provided by sensors, and the required yawing moment can be calculated according to the signals and is compared with the practical value. The control target of a lower layer controller is achieved by ensuring that yawing moment instructions sent by the upper layer controller are distributed through braking force, wherein the lower layer controller controls motor moment distribution and the slip rate of wheels so that the required yawing moment can be obtained for an automobile and the automobile can stably run.

The invention discloses a vehicle yaw stability control method based on a three-step method. A hierarchical control strategy is adopted, based on the three-step method, the front wheel turn angle and additional yaw moment are obtained, and based on a quadratic programming optimization method, the additional yaw moment is distributed into braking force on four wheels to act on a vehicle. The method includes the steps of firstly, establishing a simplified vehicle dynamics model, wherein the two-degree-of-freedom model is used for representing the relation between the steering stability of the vehicle and the lateral movement and yaw movement of the vehicle; secondly, designing a three-step method controller, wherein expected yaw velocity information is input into the three-step method controller, and the additional yaw moment and the front wheel turn angle are determined in a three-step method algorithm flow according to the value of expected yaw velocity and the lateral acceleration, actual yaw velocity, actual sideslip angle and longitudinal speed, fed back in real time, of the vehicle; thirdly, performing vehicle yaw stability control based on the three-step method controller designed in the second step.

The invention discloses an integrated control method for yaw and roll stability of an off-road vehicle driven by a wheel hub motor, which obtains the operating parameters of the vehicle, obtains the lateral load transfer rate and lateral motion balance equation at the current moment, and then obtains the predicted lateral load at the next moment Transfer rate; determine the yaw stability working condition according to the yaw angular velocity and the side slip angle of the center of mass; determine the control mode of the yaw and roll integrated control system according to the predicted lateral load transfer rate and yaw stability working condition. When the absolute value of the predicted lateral load transfer rate is less than the safety threshold, the yaw stability control is the primary goal; when the absolute value of the predicted lateral load transfer rate is greater than or equal to the safety threshold, the roll stability control is the primary goal. Stability control is a secondary goal. The invention realizes the coordinated optimization of the roll stability control system and the yaw stability control system, eliminates conflicts when the two subsystems are independently controlled, and performs coordinated control to ensure the safety of the vehicle.