33 results about "Electronic stability control" patented technology

The invention discloses a hardware-in-the-loop test method and device and electronic equipment, relates to the technical field of automotive electronics, and adopts a simulated annealing algorithm in an optimization stage, adjusts parameters according to characteristics of an electronic stability control system, optimizes data distribution, and improves test data quality and fault detection capability. In the verification stage, the generated test data is subjected to actual operation test, the data problem is fed back by comparing actual output with an expected result, and the optimized test data which does not pass verification is sent to the target hardware-in-loop test model for optimization adjustment, so that a closed-loop optimization verification process is formed. The iterative closed-loop process comprehensively covers all possible working conditions and fault modes, key test points are prevented from being omitted, the reliability of the electronic stability control system is enhanced, the accuracy, effectiveness, comprehensiveness and sufficiency of hardware-in-the-loop test of the electronic stability control system are ensured, and the reliability of the electronic stability control system is improved. And the limitation of hardware-in-the-loop test of the electronic stability control system is reduced.

The invention relates to the technical field of vehicle control, and discloses a self-adaptive cruise control method and system, a vehicle and a storage medium which are applied to a pure electric vehicle, and the method comprises the steps that according to driving state information of a front target vehicle and dynamic parameters of the vehicle, the target deceleration of the vehicle is determined in combination with a safe vehicle following distance model; when it is judged that the pure electric braking condition is not met based on the relation between the target deceleration and the braking force threshold value of the electric braking system and in combination with the real-time battery state of the vehicle, a cooperative braking mode is started; in the cooperative braking mode, the electric braking system is controlled to provide regenerative braking force, and a cooperative braking instruction is sent to the electronic stability control system, so that the electronic stability control system provides mechanical braking force for cooperative braking; the electronic stability control system further adjusts mechanical braking force distribution of all wheels of the vehicle based on the vehicle wheel speed and the vehicle body posture parameters so as to maintain stable running of the vehicle.

The application discloses a vehicle deceleration braking method, comprising the following steps: sending braking request information to an electronic parking brake system; in response to the received braking request information, sending a deceleration braking signal to an electronic brake booster through the electronic parking brake system; in response to the received deceleration braking signal, activating an electronic control deceleration function by using the electronic brake booster, and actively pressurizing a brake pipeline of the vehicle by using the electronic brake booster through a preset braking execution mode, so that the vehicle realizes deceleration braking. The vehicle deceleration braking method provided by the application can realize the electronic control deceleration function and achieve the purpose of safe deceleration parking on a vehicle without a vehicle body electronic stability control system, only by using the electronic parking brake system and the electronic brake booster.

Electro-hydraulic braking system with: several wheel brake arrangements designed to deliver braking forces to wheels; an electric brake booster with a motor to amplify a pedal force applied to a brake pedal; an electronic stability control (ESC) system comprising a pressure sensor for measuring hydraulic pressure and designed to open or close several valves arranged therein in order to distribute the hydraulic pressure to the multiple wheel brake assemblies; and an electronic control unit (ECU) designed to control a motor drive current within a range of current values ​​less than or equal to a first limiting current when the hydraulic pressure measured by the pressure sensor is less than or equal to a first reference value, and to control the motor drive current within a range of current values ​​greater than the first limiting current and less than or equal to a second limiting current when the hydraulic pressure is higher than the first reference value.

The present examples provide systems and methods for performing hydraulic braking in a vehicle. A system includes a set of hydraulically controlled brakes, a set of valves coupled with the set of brakes and configured to regulate hydraulic pressure applied to the brakes, a first hydraulic system (including a primary hydraulic pressure generator and a first controller), and a second hydraulic system (including a backup hydraulic pressure generator and a second controller). The first controller is configured to receive sensor data. Based on sensor data, the first controller determines a magnitude of hydraulic pressure applied to each hydraulic control brake, sends a pressure command to the main hydraulic pressure generator to generate hydraulic pressure, and sends a valve control command to the second controller using a high-speed communication connection.

An apparatus and method for controlling residual pressure in an electronic stability control (ESC) integrated brake system are disclosed. The apparatus for controlling residual pressure in an ESC integrated brake system of the present disclosure includes: a master cylinder configured to generate brake hydraulic pressure through a master piston; a hydraulic pressure regulating valve configured to regulate hydraulic pressure, in which the hydraulic pressure regulating valve is provided in a hydraulic pressure flow path connected between the reservoir and a wheel cylinder configured to perform braking of each wheel; and a processor configured to: adjust a position of a master piston of the master cylinder according to whether the master cylinder satisfies a preset residual pressure control activation condition; and controls the hydraulic pressure regulating valve based on the required pressure of the master cylinder and the loop pressure.

An embodiment method for transmitting speed information of a vehicle using an apparatus for transmitting speed information of the vehicle includes receiving a first speed information of the vehicle from an electronic stability control (ESC) device, the first speed information being information based on a plurality of wheels of the vehicle, averaging the first speed information, converting the averaged first speed information into a second speed information of the vehicle, based on a first period, and outputting the second speed information, based on a second period and a minimum output frequency, in which the first speed information is a digital signal and the second speed information is an analog signal.

The invention discloses a braking system, a braking method and a vehicle. The braking system comprises a first power supply and a second power supply which are independently arranged; and an electronic parking controller, a DC voltage converter, a drive-by-wire hydraulic brake controller, and an electronic stability controller. Wherein the electronic parking controller is configured to be powered by one of the first power source and the second power source, and the direct-current voltage converter is connected with the first power source and used for converting a first voltage value output by the first power source into a second voltage value smaller than the first voltage value. According to the technical scheme, on one hand, the function risk of the braking system is effectively dispersed, and the problem of single-point failure caused by the fact that functions are excessively concentrated on a single controller is avoided; and on the other hand, through power redundancy and voltage conversion, the system can adapt to the arrangement limitation of a 48V electrical architecture, meanwhile, the cooperative work between the controllers is optimized, the waste of hardware resources is reduced, and the reliability and safety of the system under complex working conditions are improved.

The embodiment of the invention provides a leakage isolation method and device for a hydraulic braking system, relates to the technical field of vehicle braking and is suitable for an electronic stability control system, the hydraulic braking system comprises a plurality of braking loops, and the method comprises the steps that it is determined that brake fluid leakage happens to the hydraulic braking system; based on a preset braking method, the multiple braking circuits are subjected to leakage testing, the testing result of each braking circuit is obtained, the preset braking method is used for simulating vehicle braking through the braking circuits to be tested, and the testing results are used for representing whether braking fluid leakage happens to the corresponding braking circuits or not; and when the vehicle is braked, based on the test results of all the brake circuits, the brake circuits with leakage are isolated, so that the brake circuits with leakage do not participate in vehicle braking. By the adoption of the method, when the hydraulic brake system leaks brake fluid, the leakage point can be isolated in time, the remaining effective brake loop is used for braking, and the brake performance of a vehicle is guaranteed.

The invention provides an optimization method, device and equipment for brake control in the vehicle cruising process and a medium, and relates to the technical field of vehicle control. The optimization method comprises the steps that multi-source sensor data collected by a plurality of sensors installed on a main vehicle are obtained; identifying the current driving condition of the host vehicle based on the multi-source sensor data, wherein the driving condition at least comprises a vehicle cut-in condition; and under the condition that the vehicle cut-in working condition is recognized, a braking control strategy corresponding to the vehicle cut-in working condition is executed, so that the electronic stability control system conducts braking operation on the main vehicle based on the braking control strategy. According to the method, the key working condition of vehicle cut-in is introduced and recognized, and therefore the braking strategy of the electronic stability control system is optimized.

This application provides a combined navigation and positioning system, method, vehicle, and computer-readable storage medium. The combined navigation and positioning system includes: an electronic stability control module for outputting a first output signal, the first output signal including a first sensing signal output by a first inertial unit in the electronic stability control module; and a combined navigation module for receiving the first output signal and fusing it with a second sensing signal output by a second inertial unit in the combined navigation module, the combined navigation module performing positioning and navigation based on the fused signal. In this application, the first sensing signal of the first inertial unit of the electronic stability control module can be fused with the second sensing signal of the second inertial unit of the combined navigation module to reduce the cumulative error of the fused signal, thereby improving the positioning accuracy of the combined navigation module.

Disclosed herein is an electric brake system including a brake including a cylinder and a piston which is provided in the cylinder to move forward or backward and is moved by hydraulic pressure so that a brake pad presses a brake disc, an electric stability control (ESC) actuator configured to generate and supply hydraulic pressure to the cylinder to brake a wheel of a vehicle, an electric parking brake (EPB) actuator configured to move the piston by a motor, and a controller configured to control the EPB actuator and the ESC actuator, wherein the controller estimates a flux in the cylinder and estimates pressure in the cylinder based on whether an EPB is applied through driving of the EPB actuator and the estimated flux in the cylinder.

The invention relates to a vehicle system (100) for a vehicle (200), in particular a commercial vehicle (202), having an electronically controllable pneumatic brake system (101) and an electronically controllable steering device (103). The electronically controllable pneumatic brake system (101) has a redundant control unit (104) which, in the event of a failure of an electronic stability control (ESC1) of the brake system (101) during driving, controls the brake circuits (2, 4). In the event of a failure of the electronic stability control (ESC1) during driving, the redundant control unit (104) actuates the front axle (VA) with a front axle redundant brake pressure (pRVA) and / or the rear axle (HA) with a rear axle redundant brake pressure (pRHA) in terms of the axles, and the electronically controllable steering device (103) carries out a steering intervention for lateral stabilization for keeping the vehicle (200) within a tolerance corridor (TK) of a predetermined target trajectory (TSoll) of the vehicle (200). The invention also comprises a vehicle (200) and a method (300).

The application discloses a master cylinder pressure estimation method and system based on wheel states, which is applied to an electronic stability control system and comprises the following steps: detecting the effectiveness of a master cylinder pressure sensor signal; if the master cylinder pressure sensor signal is effective, using the collected value of the master cylinder pressure sensor as a current master cylinder pressure estimation value; if the master cylinder pressure sensor signal is ineffective, judging whether antilock braking control is triggered; if the antilock braking control is not triggered, estimating the master cylinder pressure based on the whole vehicle deceleration; if the antilock braking control is triggered, judging whether the current is in the first antilock braking control cycle; if the current is in the first antilock braking control cycle, estimating the master cylinder pressure based on the maximum wheel deceleration of the current cycle; if the current is not in the first antilock braking control cycle, judging the wheel braking state based on at least one wheel state parameter of the current cycle, correcting the master cylinder pressure estimation value according to the judgment result, using the corrected master cylinder pressure estimation value as the current master cylinder pressure estimation value; and outputting the current master cylinder pressure estimation value for brake control.

The application discloses a vehicle control method and a vehicle. The method comprises the following steps: determining whether an interface of a vehicle control unit of the vehicle is available based on a first preset condition; determining whether an interface of an electronic stability control system of the vehicle is available based on a second preset condition; in response to the interface of the vehicle control unit being available and the interface of the electronic stability control system being available, sending an automatic parking function enable to the vehicle control unit and the electronic stability control system based on a third preset condition; and controlling the vehicle based on the automatic parking function enable. The application solves the technical problem of low efficiency of vehicle automatic parking in the related art.

Disclosed are an apparatus and a method for controlling residual pressure in an electronic stability control (ESC)-integrated braking system. The apparatus for controlling residual pressure in an ESC-integrated braking system of the present disclosure includes: a master cylinder configured to generate braking hydraulic pressure through a master piston; hydraulic regulating valves configured to regulate hydraulic pressure, wherein the hydraulic regulating valves are provided in a hydraulic flow path connecting between a reserve and wheel cylinders configured to perform braking of each wheel; and a processor configured to: adjust a position of the master piston of the master cylinder depending on whether the master cylinder satisfies a preset residual pressure control initiation condition; and control the hydraulic regulating valves based on a required pressure and a circuit pressure of the master cylinder.

Disclosed are a system and method of controlling braking of a vehicle by adjusting an amount of braking of an inner wheel during a turn of the vehicle to prevent a slip and secure a driving force of an outer wheel. The method includes the steps of receiving, by an electronic stability control (ESC) device, a function activation request; determining, by the ESC device in response to the function activation request, whether an execution condition for braking control of the inner wheel for the turn of the vehicle is satisfied, and when the execution condition is satisfied, controlling a brake pressure by determining and adjusting a brake pressure control amount of the inner wheel during the turn of the vehicle based on a pre-set coefficient.

The embodiment of the invention provides a hydraulic braking system leakage detection method and device, relates to the technical field of vehicle braking, and is suitable for an electronic stability control system. The electronic stability control system collects real-time operation data of the electromagnetic valve and real-time operation data of the motor pump; brake fluid consumption is obtained, wherein the brake fluid consumption is the real-time brake fluid amount in a hydraulic pipeline of the hydraulic brake system; the real-time operation data of the electric cylinder and the consumption amount of the brake fluid are compared with a preset detection condition, a detection result is obtained, the preset detection condition is used for representing the amount of the brake fluid in the hydraulic pipeline when the electric cylinder operates under the normal operation condition of the hydraulic brake system, and the detection result is used for representing whether leakage occurs or not. According to the method, the complexity and the manufacturing cost of the hydraulic brake system can be reduced, the occupied space of the system can be reduced, brake fluid leakage detection can be conducted in real time, the brake safety function coverage rate is increased, the brake performance is improved, and safety is guaranteed.

Examples provide systems and methods for performing hydraulic braking in a vehicle. One system includes a set of hydraulically controlled brakes, a set of valves coupled to the set of brakes and configured to modulate hydraulic pressure applied to the brakes, a first hydraulic system including a primary hydraulic pressure generator, and a first controller, and a second hydraulic system including a backup hydraulic pressure generator and a second controller. The first controller is configured to receive sensor data. Based on the sensor data, the first controller determines an amount of hydraulic pressure to apply to each of the hydraulically controlled brakes, transmits a pressure command to the primary hydraulic pressure generator for generating hydraulic pressure, and transmits, using a high speed communication connection a valve control command to the second controller.

This application provides a method, apparatus, device, and medium for predicting the road surface adhesion coefficient for autonomous driving, comprising: acquiring the original time-domain signal generated by the contact between the tire and the road surface when the vehicle is driving; preprocessing the original time-domain signal and extracting a multi-dimensional time-domain feature vector; inputting the multi-dimensional time-domain feature vector into a trained road surface adhesion coefficient prediction model; processing the multi-dimensional time-domain feature vector using a probabilistic sparse self-attention mechanism; and outputting a prediction interval consisting of the lower and upper bound prediction values ​​of the road surface adhesion coefficient; encapsulating the prediction interval of the road surface adhesion coefficient according to a standard protocol and sending it to the autonomous driving application module through an in-vehicle network interface for dynamically calculating braking distance or triggering electronic stability control intervention. This solves the technical problems of poor anti-interference capability and single feature dimension in existing road surface adhesion coefficient prediction methods, and improves the accuracy of the road surface adhesion coefficient.

The embodiment of the application provides an electronic hydraulic brake system and a vehicle, and relates to the technical field of brake systems.The electronic hydraulic brake system comprises an electronic stability control system and two master cylinder modules, and the control method of the electronic hydraulic brake system comprises response measures for different faults, and each fault can be classified according to the response measures.During operation, the controller makes different response measures according to different categories of faults, and in the case that the first master cylinder module fails, the second master cylinder module or the electronic stability control system can still provide supplementary assistance to brake, so that the case that the first master cylinder module fails can be responded to with good braking capability.

The invention relates to a method for controlling a motor vehicle comprising an EAS and an ESP implementing the method, consisting, after having detected (100) a roll angle greater than a first determined threshold, referred to as critical threshold, corresponding to the start of tilt of the vehicle, in controlling (200) the EAS to apply (300) a first steering torque to the steered wheels of the vehicle with a determined steering angle and a positive determined acceleration, in the tilting direction, and then, when the roll angle reaches a second determined threshold, lower than the first threshold, and with a determined negative angular acceleration, in applying (400) a determined counter-steering torque, in a direction opposite to the tilting direction; the successive steering and counter-steering torques making it possible to counter the tilting force of the vehicle and allowing resumption of control (500) of the vehicle by the ESP.

The invention discloses a wheel state-based master cylinder pressure estimation method and system, which are applied to an electronic stability control system, and the method comprises the following steps: detecting the validity of a master cylinder pressure sensor signal; if so, using a collection value of a master cylinder pressure sensor as a current master cylinder pressure estimation value; if yes, whether anti-lock control is triggered or not is judged; if not, estimating the main cylinder pressure based on the whole vehicle deceleration; if so, judging whether the current anti-lock control cycle is in the first anti-lock control cycle or not; if in the first anti-lock control cycle, estimating the master cylinder pressure based on the maximum wheel deceleration of the current cycle; if the main cylinder pressure estimation value is not in the first anti-lock control cycle, the wheel braking state is judged based on at least one wheel state parameter of the current cycle, the main cylinder pressure estimation value is corrected according to the judgment result, and the corrected main cylinder pressure estimation value serves as the current main cylinder pressure estimation value; and outputting the current master cylinder pressure estimation value for brake control.

The present application relates to the technical field of vehicle speed prediction, and in particular to a vehicle speed prediction method, device and computer program product. The vehicle speed prediction method comprises: collecting a first driving parameter of a vehicle in a current period; determining a working condition classification corresponding to the first driving parameter based on the first driving parameter; inputting the first driving parameter, a second driving parameter of a previous period and a vehicle speed error obtained according to the previous period into a vehicle speed prediction model corresponding to the working condition classification to obtain a predicted vehicle speed output by the vehicle speed prediction model. The present application selects and adjusts the vehicle speed prediction model in a targeted manner through working condition classification, effectively improves the accuracy and real-time performance of prediction, and provides more reliable vehicle speed information support for electronic control systems such as an anti-lock braking system (ABS) and an electronic stability control system (ESC).

An electronic stability control system for a vehicle is disclosed. The electronic stability control system for a vehicle may include: first, second, third, and fourth acceleration sensors mounted on each wheel of the vehicle to detect the lateral acceleration and vertical acceleration of the corresponding wheel; a controller configured to be connected to first, second, third, and fourth acceleration sensors and receives lateral accelerations and vertical accelerations of the four wheels, calculate maximum values of lateral accelerations of front and rear wheels and lateral tire stiffness of the front and rear wheels considering load movement based on the lateral accelerations and vertical accelerations of the four wheels, calculate side slip angles of the front and rear wheels and a difference between the side slip angles of the front and rear wheels based on maximum values of lateral angular velocities of the front and rear wheels and the lateral tire stiffness of the front and rear wheels considering load movement, and determine brake pressure and a target wheel to which the brake pressure is to be applied in response to the difference between the side slip angles of the front and rear wheels exceeding a set value; and an actuator configured to receive a control signal from the controller and apply the brake pressure to the target wheel. An electronic stability control method for a vehicle using the electronic stability control system is further disclosed.

The invention discloses an intelligent chassis slippery mode control method and system based on multi-source sensing and a vehicle. The method comprises the steps that multi-source sensing data of the vehicle are collected through multiple sensors; preprocessing and fusing the multi-source sensing data to obtain fused data; carrying out wet and slippery scene identification according to the fusion data, determining a scene category corresponding to the vehicle, and carrying out risk assessment on the vehicle to obtain a risk assessment level; and according to the scene category and the risk assessment level, normal mode control, wet-slip mode control or extreme wet-slip mode control is carried out on a hybrid power control unit, an electronic stability control unit and a suspension of the vehicle. The method can improve the recognition accuracy of the slippery scene of the vehicle, is high in response speed, is wide in scene adaptability, and can be widely applied to the technical field of vehicle control.

The application discloses a simulation detection analysis method and system for vehicle body electronic stability control, and belongs to the technical field of simulation detection; pressure limiting valve sealing data, wheel speed sensor data and ground grip sensing data of a vehicle body electronic stability control system are collected; a fault mode database of a single running time period corresponding to a test scene is constructed; the fault mode database of all running time periods is acquired, the probability that the test scene simultaneously appears pressure limiting valve sealing failure, wheel speed sensor drift failure and ground grip sensing abnormal failure in the next running time period is predicted; if the pressure limiting valve sealing failure, the wheel speed sensor drift failure and the ground grip sensing abnormal failure simultaneously appear, the braking stability parameter of the test scene in the next running time period is calculated; a preset threshold value is analyzed and early warning is performed, and finally, comprehensive monitoring of the vehicle body electronic stability state and adaptive adjustment of the simulation strategy are realized, and the accuracy and safety guarantee capability of simulation detection are improved.

The invention relates to a vehicle body electronic stability control system PCBA performance detection platform, which comprises a control unit and an execution bottom plate, one or more PCBA burning test tools are installed on the execution bottom plate, each PCBA burning test tool comprises a test bottom plate, and a PCBA adapter plate and a PCBA test base for placing a PCBA are assembled on the test bottom plate; a probe for connecting the PCBA and the PCBA adapter plate is mounted on the PCBA test base; the top of the test pressing plate is controlled by a driving structure, and the driving structure is configured to drive the test pressing plate to move towards or away from the PCBA test base in the vertical direction; the bottom of the test pressing plate is provided with a plurality of press-fitting salient points, and the press-fitting salient points are configured to provide mechanical pressure for the PCBA as required. According to the ESC controller PCBA performance test platform, scattered test equipment is integrated on a unified platform, full-process automatic test is realized, the efficiency of ESC controller PCBA performance detection is greatly improved, a real vehicle environment is simulated, test items are fully covered, and the performance of an ESC system is ensured.

Method for automatically controlling a vehicle's driving state (118) in a terrain mode optimized for a road surface, the method comprising the following steps: Obtaining road surface data from a camera (104) attached to the vehicle (118) and designed to capture an image of the road surface; Inputting the road surface data into a pre-trained, deep learning-based learning model that is trained to estimate a road friction coefficient according to the road surface; Determine, based on the estimated road friction coefficient, a terrain mode optimized for the road surface, and generate optimal terrain mode information; and Controlling an in-vehicle module based on optimal terrain mode information, characterized by the fact that Estimating the coefficient of road friction involves the following steps: Measuring a wheel speed and wheel torque value of a wheel attached to the vehicle (118) using an electronic stability control (ESC); and Estimating the road friction coefficient based on the measured wheel speed and the measured wheel torque value.

A vehicle control system conducts contact avoidance brake control and electronic stability control on a vehicle using a braking unit. The vehicle control system includes one or more processors, and one or more storage media in which a program to be executed by the one or more processors is stored. The program includes one or more commands that are directed to cause the one or more processors to perform a skid prediction process and an enabling process based on a reference vehicle behavior and a control value of the contact avoidance brake control. The skid prediction process is adapted to predict whether the vehicle will exhibit a skid behavior during the contact avoidance brake control. The enabling process is adapted to enable the electronic stability control if the electronic stability control is in a disabled mode when it is predicted that the vehicle will exhibit the skid behavior.