848results about "Vehicle steering/rolling behaviour" patented technology

This invention discloses an artificial apparatus of mobile booster steering system which is servo-motor used to mock the resistance force the mobile exerts on the output axis of the steering and to transmit the torque signals to the data collection card. The servo motor controller is connected with the data collection card, which is used to control the torque of the resistance servomotor. The current sensor is used to measure the motor current of the EPS, and provide a proportional voltage signals to the motor current for the data collection card. The angle sensor locates on top of the steering wheel and is used to measure the angle of the wheel and provide angle signals to the data collection card. The computer collects and transmits control orders through the data collection card and processes the data and gets the measurement results.

The invention discloses a device for testing the performance of an automotive steering system, comprising a steering simulating system, an axial loading system, a suspension fork simulating system and an automotive steering system, wherein the steering simulating system is used for simulating the rotation of a steering wheel in an automatic and manual mode; the axial loading system is used for simulating a steering load and loading the steering load to the automotive steering system (comprising a steering column, a steering gear, a tie rod and a simulation steering knuckle) through a Bell mechanism; the suspension fork simulating system is used for simulating wheel jumpiness during driving. The device for testing the performance of the automotive steering system is used for experimenting and testing the steering performance of an automotive steering in various driving conditions, such as experiments and tests of kinematic and mechanic parameters of full angle, transmission ratio characteristic, transmission clearance characteristic, transmission efficiency characteristic, driving moment, rigidity, relationship between steering performance and suspension fork jumpiness and the like. The device directly simulates the steering wheel to load the automotive steering through the Bell mechanism, so that the testing result is closer to a real working condition.

The present invention discloses a test method and device applied to a driverless vehicle. According to one embodiment of the invention, the method includes the following steps that: a terminal sends location information to a driverless vehicle in a test site; when a location in a real driving environment, which is corresponding to the driverless vehicle, is a preset location, environment sensing information of a preset event corresponding to the preset location is sent to the driverless vehicle; and the output information of a functional module is obtained, and whether the functional module is normal is judged based on the result of the comparison of the output information and preset information corresponding to the functional module. With the test method and device of the invention adopted, whether the functional modules of the driverless vehicle during various kinds of events in the real driving environment are normal can be tested, and the safety risks of tests in the real driving environment can be avoided.

The invention provides a comprehensive performance test rig of a vehicle electric power steering system. The comprehensive performance test rig includes a rack part, an electric control part and a computer control system; and the rack part comprises a base, a rotary table, a fixture clamp plate, a C-EPS fixture clamp, an input terminal driver, a C-EPS output terminal loading device, a P / R-EPS output terminal loading device, a fixture clamp bench, and an adverse impact part. The comprehensive performance test rig of the invention can comprehensively test three types of electric power steering systems, wherein the three types include a C-EPS, a P-EPS and an R-EPS. Compared with a conventional electric power steering test rig, the control system has good real-time performance, can provide the real-time vehicle dynamics simulation environment, and can provide the comprehensive high-precision multiple performance tests of three types of the EPS.

This invention relates to one motor aid rotation system life test bench, which comprises tested EPS sample, signal generation module, display meter module and load device, wherein, the EPS sample comprises rotation disc, rotation part, rotation sensor and motor bus and controller; controller is to send the voltage signal into motor bus and to sensor with work power and to send the fault signal into display meter module; motor bus is connected with mechanic system through acceleration device with output end connected with load device; signal generation module is connected to controller, display device module.

A power relay is provided in a power line, which supplies power from a power source to a motor through an inverter circuit, to shut off power supply from the power source to the inverter circuit when an abnormality arises. A microcomputer diagnoses a short-circuit failure of the power relay when a steering wheel is not steered during a normal control operation of assisting the steering operation of the steering wheel. An EPS shuts off power supply by the power relay when the steering wheel is not steered, so that the short-circuit failure of the power relay is diagnosed without affecting the assist operation for the steering wheel.

The invention provides an electric steering system test bench and a test method thereof. Multiple items of test can be carried out on the electric steering system before whole vehicle assembly, the electric steering system can be developed perfectly, and the whole vehicle development time is saved. The electric steering system test bench is composed of a torque steering wheel, a mechanical steering gear assembly with a lateral drawbar, a signal conversion module capable of converting inputted control signals into CAN signals, and a power supply module, wherein the end part of the lateral drawbar of the mechanical steering gear assembly is connected with a force sensor and/or a loading device for providing load. The electric steering system test method comprises the following steps: a steering column of the to-be-tested electric steering system and the mechanical steering gear assembly are mounted together, the torque steering wheel is fixedly arranged on the steering column, the signal conversion module and the power supply module are respectively connected with a boosting module of the to-be-tested electric steering system, and then different input output parameters are set according to requirements for realizing different test verification.

A method and a system for determining a cornering angle of a tyre fitted on a vehicle during running of the vehicle on a rolling surface. The tyre has an equatorial plane. In the method, the length of the contact region between the tyre and the rolling surface is estimated, the length being measured at a distance from the equatorial plane; the load exerted on the tyre is estimated; a camber angle to which the tyre is subjected, is estimated; and the cornering angle is derived from the camber angle, tyre load and contact region length.

The invention discloses an electric power-assisted steering test bed, which comprises an EPS system assembly and a detection system, and is characterized by further comprising a loading mechanism, a test device control system, wherein the EPS system assembly also comprises a right-steering front-wheel assembly which consists of a steering control arm, a steering knuckle arm and a front wheel, the steering control arm and the steering knuckle arm are connected with the front wheel, the other end of the steering knuckle arm is connected with a steering transverse pull rod, one part of the loading mechanism is linked with a steering rack, the other part of the loading mechanism is linked with the steering control arm, and the test device control system is electrically connected with the EPS system assembly and the loading mechanism. The electric power-assisted steering test bed has high simulation precision of steering resistance and good timeliness of the control system, and can provide a real time dynamics simulation environment of vehicles. The electric power-assisted steering test bed realizes a good platform for performing performance test on the EPS system.

A method and system may detect a fail of a steering angle sensor in an electric power steering apparatus. The system may include: a steering angle sensor for generating and transmitting a steering angle signal measuring a rotation angle of a steering wheel; a motor for generating an assistant power for smooth steering and transmitting a current and a voltage based on rotation of the motor; and an Electronic Control Unit (ECU) for receiving the current and the voltage from the motor, sensing the rotation direction of the motor, receiving the steering angle signal from the steering angle sensor, sensing a first rotation direction of the steering wheel, and then, when the rotation direction of the motor is not equal to the first rotation direction of the steering wheel, determining that the steering angle signal has a fail and starting operation of a fail-safe logic.

The invention discloses a simulation test bed for a novel electro-hydraulic steering system of a commercial vehicle. The simulation test bed is used for the research of steering characteristics, the development and verification of steering assisting control strategies as well as the monitoring and evaluation of steering control effects of the novel electro-hydraulic steering system of the commercial vehicle. The test bed is composed of a simulation scene display device, a real-time simulation platform, a hydraulic power assisting system, a driver control device, a mechanical steering system, an electric power assisting device, a steering resistance simulation device, a base frame and a seat; the simulation scene display device is used for displaying vehicle states and control effects in real time; the electric power assisting device is used for improving the steering characteristic of the steering system, and integrating other chassis electronic control systems; and the steering resistance simulation device is used for simulating steering resistance between tires and the ground. According to the test bed, based on real-time interaction between the driver and the steering system and the real-time scene simulation of the simulation scene display device, and a hardware platform can be provided for the research of the steering characteristics and the development and verification of the steering assisting control strategies of the novel electro-hydraulic steering system of the commercial vehicle.

Sensor data is recorded during testing of a control unit of an autonomous car in an autonomous driving mode. In response to being triggered by a disengagement event, recorded sensor data from an analysis time window prior to the disengagement event is logged. The logged sensor data is processed in a simulator using the control unit to control a virtual autonomous car to identify the inadequately operating component of the control unit. The component may be modified and retested until the disengagement event is avoided in the simulator. The control unit with the modified component may then be used to record new sensor data during testing of the control unit in the autonomous driving mode, and the simulation repeated on the new data.

A device for simulating slip on vehicle test benches wherein a vehicle wheel which rolls on a movable testing surface of a test device such as a test roller or flat belt and performs the object of changing the frictional force between the wheel and the testing surface without necessarily having to change the coefficient of friction, A lifting/lowering device changes the contact force FA of the wheel in a predeterminable way from the tire to an apparatus as the wheel rotates.

A time series myoelectric potential signal is acquired, which is representative of time series activity amount of a muscle of a driver when the driver is performing a driving operation on the vehicle, the muscle being involved in the driving operation. Based on the acquired time series myoelectric potential signal, a parameter value indicative of a fluctuation amount of the time-series myoelectric potential signal and an average value of the myoelectric potential signal are obtained. Drivability of the vehicle is evaluated based on the obtained parameter value and the obtained average value.

The present invention discloses an electric power steering controller hardware function test board. The electric power steering controller hardware function test board comprises an upper computer and a simulation signal generation module. A controller to be tested is configured to burn in base hardware function test software; the upper computer is provided with upper computer measurement and control software; the upper computer is configured to send test instructions and simulation parameters to the controller to be tested and receive the test results fed back by the controller to be tested; the upper computer is configured to send the simulation parameters to the simulation signal generation module; the simulation signal generation module is configured to generate simulation signals according to the simulation parameters and instructions sent by the upper computer and output the simulation signals to the controller to be tested; the base hardware function test software of the controller to be tested is configured to control the operation of the controller to be tested according to the test instructions and the simulation parameters, collect the electrical function data of each hardware of the controller to be tested and feed back to the upper computer. The electric power steering controller hardware function test board is able to perform individual test of electrical parameters of the hardware module circuit of the electric power steering controller.

The invention belongs to the technical field of automobile electric power steering, and specifically relates to a performance test system for an automobile electric power steering system. The performance test system includes a testing stand pedestal, a motion control mechanism for providing experiment simulation kinetic energy input, and a measurement and control system for performing detection and acquisition of experimental data, wherein the measurement and control system includes a real-time controller, a sensor unit and a data acquisition module; the sensor unit is connected with the real-time controller through the data acquisition module; and the real-time controller is connected with an upper computer. The performance test system for an automobile electric power steering system can complete a performance test for an electric power steering system indoors so as to save the real vehicle experiment to effectively reduce the cost, and is high in accuracy and reliability.

The invention relates to a method for testing the steering performance of a tracked vehicle. The method comprises the following steps of testing parameters related to the performance of the vehicle in an actual steering test through a testing system, obtaining changes of kinematic parameters and dynamic parameters in the steering process of the tracked vehicle, verifying the reasonability and accuracy of an established steering kinematic and dynamic model of the tracked vehicle, the reasonability of a steering radius correction coefficient formula and the reasonability of a steering angular speed correction coefficient formula, checking the variation range of a steering radius correction coefficient and the variation range of a steering angular speed correction coefficient under general ground conditions, analyzing and verifying the influences of various factors on tractive force and braking force of tracks on the two sides of the tracked vehicle, and examining the variation trend of the kinematic parameters and the variation trend of the dynamic parameters. The various steering parameters generated during steering are obtained at the same time, coupling characteristics between vehicle system dynamics and structural dynamics are accurately reflected, and effective measures are provided for the system structure design, demonstration and improvement on the tracked vehicle.