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.

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 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.

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 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 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 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.

The invention discloses a vehicle internal resistance testing method. Sliding tests are respectively performed on a whole vehicle and all detached parts on a chassis dynamometer under different working conditions, and thus the internal resistor value of the whole vehicle and the resistor values of all part systems such as a braking system, a transmission system, a speed changing box and a main speed reducer in states corresponding to various working conditions are obtained. The vehicle internal resistance testing method has the advantages of being high in university, high in precision, low in cost and short in testing cycle.

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.

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.