316 results about "Chassis dynamometer" patented technology

The invention provides a method for testing the electromagnetic compatibility (EMC) of an electrically-driven automobile. The electromagnetic interference of the electrically-driven automobile is different from that of the common internal combustion engine automobile, as far as the work principle of the electrically-driven automobile is concerned, the electrically-driven automobile has stronger electromagnetic disturbance property and higher anti-electromagnetic interference due to the application of a large-scale electronic system, the electrically-driven automobile is arranged on a loaded chassis dynamometer and runs on the chassis dynamometer at specific speed, the chassis dynamometer realizes energy absorption, and the electromagnetic compatibility of an automobile in a running state is evaluated from two angles of automobile electromagnetic interference (EMI) and automobile electromagnetic susceptibility (EMS), thereby when the automobile normally runs, the electromagnetic interference of the automobile can be accurately measured.

The invention is a system experiment method for multiple operating condition carriers in simulating road test. When detecting each kind of operating condition simulating to automobile road test with chassis dynamometer of automobile, it uses road test vehicle to slide in neutral gear to detect the system resistance at each speed point, uses free and secondary sliding method or secondary free sliding method by increasing or subtracting inertia, detects the system resistance at each speed point and the equivalent weight inertia of each part of the automobile, and detects the turbine force at each point, carries on accurate loading to automobile through the demarcation of the turbine. The method is accurate and quick.

The invention relates to vehicle pollutant discharging total measuring device and method. The device is made up of diluting sampling tube, fan, computer measure-control system, chassis power measuring machine, fan flow rate adjusting device, flow rate, temperature, and pressure measuring devices, five components tail gas, O2, CO2 gas analysis devices. The measuring method includes the following steps: using fan flow rate adjusting device to control pumping drainage fan, measure diluted tail gas flow rate, temperature, pressure, O2, CO2 volume density; using five components gas analysis device to measure undiluted tail gas for each gas volume density; calculating out the undiluted tail gas flow rate by the volume density ratio to gain vehicle pollutants discharging gross. The invention has high detecting precision for tail gas, can be used in pollutants discharging gross detecting for vehicle operating condition method tail gas detecting line or repair shop.

The invention relates to a test system and a test method for the traction performance of automobiles. The test system comprises road gliding equipment, performance test equipment and data acquisition equipment, wherein the data acquisition equipment is connected with the road gliding equipment and the performance test equipment respectively; the road gliding equipment is used for testing preparation data; and the performance test equipment is used for testing the preparation data, traction performance data of the maximum towing hook and traction performance data of each shift towing hook. The test method comprises the following steps of preparing, testing the traction of the maximum towing hook, testing the traction performance of each shift towing hook and classifying the data. In the method, load tow trucks on roads are simulated by utilizing a chassis dynamometer in a method of gradient application, and compared with a method of using the load tow trucks on the roads, the method has simplicity of control and operation on indoor revolving drums and is easy to realize; and compared with a constant speed method used on the chassis dynamometer, the method has the advantage that the driving resistance of the automobiles on straight road surfaces is considered fully and the advantage that the actual traction for the automobiles on the towing hooks can be measured integrally.

The invention discloses an indoor testing device and method for the vehicle heat balance ability, and belongs to the field of vehicle cooling system heat balance technologies. The device comprises a chassis dynamometer, an environment bin with a temperature control system, a cooling fan and a temperature data collection system. The chassis dynamometer is arranged in the environment bin. The cooling fan is arranged in front of a vehicle to be tested in the environment bin and used for simulating the air speed. The temperature data collection system is arranged in the vehicle to be tested and used for measuring the temperature of a vehicle water way and the environment. According to the indoor testing device and method, the heat balance ability of an engine and a cooling system of the vehicle are tested fast and effectively, the maximum power point of an external characteristic curve of the engine, the water inlet and outlet temperature, at the maximum torque point, of the engine and the water inlet and outlet temperature of a radiator are tested, matching and requirements of the engine and the cooling system of the vehicle can be judged in real time, and the state of the sample vehicle to be tested can be adjusted for research and development.

A vehicle speed control system for controlling a vehicle on a chassis dynamometer is comprised of a controller which is arranged to receive a vehicle speed command, to obtain an anticipated vehicle speed command from the vehicle speed command taking account of a delay factor of a control system of the vehicle, to calculate a driving force a driving force command from the anticipated vehicle speed command, to obtain an accelerator opening command from a previously stored driving force characteristic map based on the driving force command and a detected vehicle speed, and to control an accelerator opening of the vehicle according to the accelerator opening command so as to adjust the detected vehicle at the vehicle speed command.

The invention discloses an adjustable-axle distance roller device, which comprises a machine frame, a primary roller, a secondary roller, a tire diameter detection device, a roller axle-distance detection and regulation device, a transmission device and a tensioning mechanism. When the device is used, vehicle detection equipment, such as braking detection platforms, chassis dynamometers and speedometer calibration consoles, can realize the automatic adjustment of the axle distance of rollers, the requirements for the longitudinal positioning of tires of different diameters and the adjustment of an adhesive force in a detection process are met, the detection accuracy and efficiency are improved, and the range of vehicles detected is enlarged; a wheel lifting mechanism is not required to be arranged between the primary and secondary rollers; and the adhesive force can be regulated by changing the sum of the supporting forces applied by the rollers onto the wheels in a normal direction so as to realize the simulation of different adhesion coefficients.

The invention discloses a vehicle power testing method and a vehicle chassis dynamometer. The method comprises the following steps that: a vehicle chassis dynamometer carries out a positive test on a tested vehicle so as to obtain a power of a wheel driving force of the tested vehicle; the vehicle chassis dynamometer carries out a reverse test on the tested vehicle so as to obtain a driving tyre rolling resistance loss power; the vehicle chassis dynamometer carries out a test to obtain a dynamometer internal resistance loss power on the condition that a motor of the vehicle chassis dynamometer is in a no-load positive rotation state; and the vehicle chassis dynamometer calculates a chassis output power of the tested vehicle according to the wheel driving force power, the driving tyre rolling resistance loss power, and the dynamometer internal resistance loss power. According to the invention, a vehicle chassis dynamometer is employed to carry out an indoor test on a power output change of an engine of a tested vehicle; and an obtained chassis output power of the tested vehicle has a high accuracy; besides, the method has simple operation and can be realized easily.

A vehicle locking device locking a vehicle on a chassis dynamometer, equipped with rollers allowing driving wheels of the vehicle placed thereon, while keeping the driving wheels thereof placed on the rollers, was configured so as to detect angles of traction, to determine traction forces optimum for hauling the vehicle based on the detected angles, and to control the vehicle locking device based on thus-determined traction forces so as to take up a belt, aiming at readily and stably locking a test vehicle under optimum traction forces.

The invention discloses an integrated multifunctional automobile chassis dynamometer, comprising a rack, a left main roller, a right main roller, an eddy current machine, a flywheel, a force sensor, a left lifting jack and a right lifting jack, wherein the left main roller, the right main roller, the eddy current machine and the flywheel are in transmission connection, and the force sensor is matched with the eddy current machine; the left main roller and the right main roller are provided with a left assistant roller and a right assistant roller in a pairing mode, and the left assistant roller is in transmission connection with the right assistant roller; one side of the left main roller is provided with a velocity sensor, a left clutch is arranged between the left main roller and the right main roller, and a right clutch is arranged between the right main roller and the eddy current machine; the other sides of the left assistant roller and the right assistant roller are respectively provided with an overrunning clutch and a reduction box which are in transmission connection, and the reduction box is supported on a bearing in a floating mode and is driven by a motor; and the reduction box is also provided with a dynamometer link, and a braking force sensor which is matched with the dynamometer link is arranged on the rack. The automobile chassis dynamometer integrates multi-functions into a whole and has the advantages of less investment and floor area and high device utilization rate.

A motorized chassis dynamometer machine. In one embodiment, the dynamometer machine includes a fixed frame assembly. At least one roller assembly is mounted on the fixed frame assembly. At least one independent motor assembly is connected to each roller assembly. The independent motor assembly is used for driving the roller assembly. At least one independent loading dynamometer assembly capable of measuring the vehicle input power at each roller assembly is coupled to each roller assembly. In a preferred embodiment, the dynamometer assembly is only operable for loading each independent roller assembly, while the motor assembly is operable for driving each independent roller assembly. The machine has at least one motor controller capable of controlling each independent motor assembly and at least one dynamometer controller capable of controlling each independent dynamometer assembly. Each roller assembly, motor controller and dynamometer controller are in turn controlled and manipulated by an overall controller. The dynamometer machine may further include a torque sensor for each motor assembly and each dynamometer assembly. The torque sensors are used to measure torque reaction, each torque sensor independently measuring torque for each of the roller assemblies.

The invention relates to a test method and a test device of the emission of methanol automobile exhaust contaminant. The method comprises the following steps: setting parameters of a methanal samplingpump, then operating a methanol test automobile on a chassis dynamometer, collecting methanal automobile exhaust in the cycle operation process, continuously diluting and mixing collected exhaust byusing air, and sampling and analyzing methanal exhaust contaminant after the cycle operation of the methanol test automobile is finished; separating by a chromatographic column and measuring by a highperformance liquid chromatograph, thereby analyzing and calculating the concentration of the absorbed methanal and calculating the emission quality of the methanal contaminant by adopting a formula:M[HCHO]=V[mix]*C[HCHO] / d. The invention mainly provides the test method and the test device which can realize that the content of conventional contaminants of carbon monoxide (CO), hydrocarbon (HC), nitric oxide (NOX) and particulate matter (PM) as well as the content of unconventional exhaust contaminant methanal (HCHO) can be collected and analyzed simultaneously and the emission concentration of the methanol automobile exhaust can be accurately tested during a test circulation, and solves the technical problem that the emission concentration of the methanal in the automotive exhaust can notbe accurately tested and quantitatively evaluated.

The invention discloses a tyre rolling resistance testing method and a chassis dynamometer. The tyre rolling resistance testing method comprises that: the chassis dynamometer performs reverse drag test on a tyre in a whole vehicle testing state to obtain a reverse drag resistance; the chassis dynamometer performs no-load test to obtain the internal resistance of a drum; and the chassis dynamometer calculates the rolling resistance of the tyre of the tested vehicle according to the reverse drag resistance and the internal resistance of the drum, wherein the rolling resistance of the tyre is the difference obtained by subtracting the internal resistance of the drum from the reverse drag resistance. The whole vehicle is tested by adopting the chassis dynamometer, and the rolling resistance of the tyre of the tested vehicle can be obtained, so that the influence of uncertain factors such as external environment, human operation and the like on the vehicle power test is reduced, the testing result is accurate, and the method is simple and convenient to operate and easy to implement.

The invention relates to a dynamometer for an automobile chassis, aiming at solving the shortages that the existing dynamometer for the chassis has unstable detection data, low accuracy and poor reliability, is difficult to correctly evaluate the power performance of the vehicle and the like, and the defects that the dynamometer can not realize the compatibility of power performance detection function and emission inspection function. The invention provides a dynamometer for the automobile chassis, comprising a stander, an anti-drag motor, an eddy current machine, a force measurement sensor and a speed sensor arranged on the eddy current machine, and a pair of driving roller and driven roller linked to each other; two ends of the driving roller and the driven roller are rotatablely connected on the stander by a bearing respectively; the driving roller is connected with the eddy current machine and the anti-drag motor; and the force measurement sensor adopts a dual-range sensor. The invention provides a measurement and control method for the dynamometer used for the automobile chassis. The dynamometer for automobile chassis and the measurement and control method thereof have stable detection data, high accuracy and good reliability and can realize the compatibility of the power performance detection function and emission inspection function.

The invention relates to the technical field of vehicles and discloses an automobile climbing testing method and system. The testing method comprises the steps: S1, a testing environment and a tested automobile are prepared before testing; S2, the tested automobile and a chassis dynamometer are preheated; S3, a road coasting test is conducted on the tested automobile and meanwhile running data in the testing process are recorded; S4, data analysis and comparison are performed according to the data recorded in the step S3 and judgment whether the climbing performance of an automobile meets the design requirement or not is made. According to the testing method, the chassis dynamometer is adopted to simulate an actual track, conduct climbing performance testing on the automobile and acquire the running data of the automobile in the testing process, the data acquisition process is simple, convenient and quick, the accuracy of acquired data are higher, the testing method is safe, and testing cost can be greatly reduced.

The invention discloses a test method and system of driving mileage of a pure electric automobile. The test method comprises steps of: charging a to-be-tested vehicle until the to-be-tested vehicle is fully charged; installing the to-be-tested vehicle on an automobile chassis dynamometer and carrying out cycle tests for N times on the to-be-tested vehicle according to a target test working condition; acquiring the driving mileage of the to-be-tested vehicle during the cycle tests for N times and a first parameter value of a power cell during the cycle tests for N times; controlling the to-be-tested vehicle to be subjected to the test according to the maximum speed and stopping the test until a preset condition is met; acquiring a second parameter value of the power cell during the test at the maximum speed; and estimating the driving mileage of the to-be-tested vehicle in the complete working condition cycle according to the driving mileage of the to-be-tested vehicle during the cycle test for N times, the first parameter value and the second parameter value. In this way, rapid test for the driving mileage is achieved and accurate test results can be ensured; and the repeatability rate is high and the operation is simple, so test periods and cost are reduced.

The invention discloses a system and a method of analyzing energy consumption of an electric vehicle. The system comprises an electric quantity measuring module, a shaft power measurement module, a power acquisition module and a calculation module, wherein the electric quantity measuring module is used for measuring total output electric quantity of a power battery when a test vehicle drives at a preset vehicle speed at a preset ambient temperature; the shaft power measurement module is used for measuring total power absorbed by a driving shaft of a transmission system assembly when the test vehicle drives at the preset vehicle speed at the preset ambient temperature; the power acquisition module is used for acquiring total power absorbed by a chassis dynamometer when the test vehicle drives at the preset vehicle speed at the preset ambient temperature; and the calculation module is respectively connected with the electric quantity measuring module, the shaft power measurement module and the power acquisition module for respectively calculating the transmission system assembly efficiency and the wheel efficiency according to the total output electric quantity of the power battery, the total power absorbed by the driving shaft of the transmission system assembly and the total power absorbed by the chassis dynamometer. Thus, the overall energy consumption and the efficiency of the electric vehicle at the preset ambient temperature and the preset vehicle speed can be effectively analyzed.

The invention provides a whole-vehicle in-loop test bench system of an L3-level automobile driving automobile. The system comprises a chassis dynamometer located at the central position of an annularscreen, wherein a first vehicle is placed on the chassis dynamometer, the first vehicle comprises a first vehicle body and a first vehicle controller, at least one vehicle-mounted camera is installedon the first vehicle body, an image data signal output end of each vehicle-mounted camera is connected with an image data signal input end of the first vehicle controller, and the vehicle-mounted cameras are used for acquiring continuous test scenes displayed on the annular screen. Through the system, changing of the lane line sate in the testing process can be realized; and through real-time synchronous changing of a moving target (e.g., another vehicle, a bicycle and a pedestrian), lane lines and surroundings, whole-vehicle continuous in-loop testing of the L3-level automobile driving automobile is realized.

The invention discloses a detection method of automotive constant speed full load fuel consumption rate. A gear-box high gear is hung on a chassis dynamometer of an automobile; under the full load mode of the engine which is in the position of the maximum accelerator pedal, the fuel oil consumption of the automobile is detected by keeping a constant automobile speed at stipulating speed point in a regulated time; meanwhile the output power of a driving wheel of an engine full load automobile is measured; then the loss power of the stipulating automobile speed point and the whole system of a rack is measured; the loss power of engine accessory is set at the stipulating speed point; the three powers are summed and the normal-state power is revised to obtain the output power of the engine at the speed point; and the full-load fuel consumption rate of the automotive engine is obtained by calculation, and the load ratio of the engine is obtained.

A chassis dynamometer includes a flat-belt mechanism configured such that a drive wheel of a vehicle is placed thereon, which includes a rotating member configured to be rotated by rotation of the drive wheel, a bearing portion configured to rotatably support the rotating member, a motor configured to apply a resistance to the rotation of the rotating member, and a bearing supporting member to which a housing of the bearing portion and the motor are fixed, a base configured to support the bearing supporting member from beneath the bearing supporting member, a plurality of three-component force sensors arranged between the bearing supporting member and the base to measure a force transmitted from the drive wheel to the flat-belt mechanism, and a computing unit configured to compute moments with respect to three axes based on measurement results of the plurality of three-component force sensors.

The invention discloses a method for measuring the running resistance of an automobile. Outdoor condition parameters are simulated inside an environment cabin, the automobile runs on a chassis dynamometer at the constant speed by adjusting the opening degrees of a throttle, the wheel edge force of the chassis dynamometer and the driving force of the automobile are balanced when the automobile runs at the constant speed, and the wheel edge force of the chassis dynamometer at the moment is the running resistance of the automobile. The running resistance of the automobile under corresponding loads can be measured by loading the various loads such as full loads and half loads, measurement is not required to be carried out in a professional testing ground, road measurement data and environment cabin measurement data are compared, it is guaranteed that the error is smaller than 2% on the basis of road measurement parameters, accurate and reliable measurement data are guaranteed, the measurement period is short, cost is low, and the data accuracy is high.

At a highland, a composition rate of air resistance is low which is included in a running resistance, because air density is low. This influences a vehicle running. Hence, a high-altitude environmental test for a vehicle by use of chassis dynamometer produces a result different from that of actual-road running. Therefore, an environmental-correction calculating section is provided on an input side of a running-resistance-command generating section configured to generate a running-resistance command. The environmental-correction calculating section receives an air temperature signal and an air pressure signal which are detected inside an environmental test laboratory, calculates an environmental correction value of rolling resistance and an environmental correction value of air resistance, and calculates a target running resistance from the environmental correction values. The running-resistance-command generating section controls the chassis dynamometer by generating the running-resistance command based on the target running resistance and a speed detection signal of the chassis dynamometer.

The invention discloses a method and system for testing the sliding resistance of pure electric vehicles. The method comprises the following steps of: installing a tested vehicle on a four-wheel-driven chassis dynamometer and preheating the tested vehicle; controlling the tested vehicle in a stalled state; controlling the tested vehicle to run at a first speed; after a preset time, progressively increasing or decreasing the first vehicle speed according to a preset difference value and controlling the tested vehicle to run constantly at the first progressively increased or decreased speed until the first speed reaches a preset threshold; acquiring the wheel side speed and the first wheel side resistance of the tested vehicle constantly running at the current speed in real time, and generating a corresponding relationship between the vehicle sliding resistance and speed of the vehicle in a power-down test according to the wheel side speed and the first wheel side resistance. The method and system achieve a function of testing the sliding resistance of pure electric vehicles. The test method is safe and controllable and high in repeatability, guarantees the accuracy of a test result and a simple whole testing process.

This invention relates to one automobile pollution discharge and fuel consumption measurement device and method, wherein, the device comprises dilution sample tube with brag, wind machine, computer control system, basic chassis test machine, flow, temperature and pressure test devices and gas analysis bench and wind flow adjust device; the method comprises the following steps: computer control system controls basic chassis power machine operation and the wind flow adjust device adjusts wind flow to get standard dilution flow to test each gas volume concentration; computing real discharge pollution volume and fuel consumption through computer control system.

A securing mechanism for attachment to a chassis dynamometer for securing a motor vehicle on the chassis dynamometer, the securing mechanism including a vehicle engaging component which, when the securing mechanism is attached to the chassis dynamometer, is engageable with a vehicle on the dynamometer to thereby secure the vehicle to ensure it remains substantially stationary on the dynamometer, at least one actuator and a load beam for moving the vehicle engaging component in three orthogonal directions and into engagement with the vehicle for securing the vehicle wherein the actuator is for use with a remotely operable control system. The vehicle engaging component may be a pin for engaging hook shaped bracket that is fixed to the vehicle's axle housing of the vehicle.

There is a demand for enhancement of operability when a change of combination of rollers of a chassis dynamometer and the dynamometer is set depending upon a vehicle type of a test vehicle. A status indicating function block that indicates an equipment construction is disposed in a main menu display area that is provided on a console. With this arrangement, a current test status can be recognized. Further, a vehicle type selection window calling function block is disposed in a mode setting function button group in the main menu display area. A vehicle type selection window called by the vehicle type selection window calling function block includes a roller selection section to select rollers corresponding to the test vehicle, a setting display section that indicates a current setting equipment construction, and a setting display section that indicates a setting equipment construction during change of the setting.

The invention relates to an automobile constant speed engine specified load detection method, which defines the rotating speed range of the automobile speed under the engine rated torque and the full-load minimum fuel consumption rate when the high speed gear is engaged in a gearbox on a chassis dynamometer by an automobile, after the test and the calculation, the load constant force value of a power absorbing device of the engine defined load is determined at the defined automobile speed point, when the load working condition is defined by the engine delta rated torque, the load is controlled by the constant force of the power absorbing device, the accelerator is adjusted and stabilized, and the vehicular dynamic property and fuel economy are detected in the constant speed at the defined automobile speed point, the method has good accuracy, validity and operability, meanwhile, the method can avoid the damages to the in-use vehicles or engines with worse technology condition, thereby increasing the detection safety.

The invention discloses an electric wheel experimental device and method with a steering function in the field of electric vehicle testing. The electric wheel experimental device has a steering simulating mechanism capable of researching the load state and the motion characteristic of an electric wheel on a steering condition, uses a servo motor to drive a ball screw to drive multilayer slide blocks and the roller surface of an electric wheel compaction chassis dynamometer to generate vertical force for simulating the vertical load of the electric wheel; uses a kingpin, an electric push rod, and the multilayer slide blocks to simulate the wheel positioning parameters of the electric wheel, such as a kingpin caster angle; may research the influence of the positioning parameter on the operating condition performance tests of the electric wheel, guarantees that the electric wheel is more close to an actual operation state in test simulation in order to obtain accurate and reliable test results, may complete a load applying function, a steering simulating function, a tire positioning parameter simulating function, and an operating condition running function of the electric wheel, and achieves complete functions and a simulation effect complying with actual cases.

The apparatus described is computer controlled and includes a visual display system with a triple screen arrangement in front of and on the sides of a driver of a vehicle positioned on a chassis dynamometer. Three projectors project virtual scenic imagery onto the triple screen arrangement which spans at least 180° relative to the driver. The virtual scenic imagery has a progression which is dependent upon the speed of at least one of the drive wheels of the motor vehicle, as controlled by the driver, when the motor vehicle is positioned on rollers of the dynamometer. The apparatus may include a steering sensing arrangement for providing signals of steering actions by the driver, which signals are used to deflect the virtual scenic imagery in synchronism with the steering actions of the driver.