Abstract: [Object] Object of the present invention is to improve accuracy of the travelling test of a tested vehicle on a chassis dynamometer, and to increase realistic feeling of the travelling test. [Means to solve] A driver's aid device 5 displays, on a main screen 11, a travelling speed pattern 12 that is a driving pattern for performing a performance evaluation test of a tested vehicle 6. The main screen 11 displays thereon topographical feature information 13 of a road where the travelling test is carried out. A marker 14 that indicates a vehicle state is shown at an intersection of the topographical feature information 13 and a reference line 15 that indicates a present position of the tested vehicle 6. This marker 14 is shown with the marker 14 inclined in accordance with a gradient of the road where the test is carried out. Further, a curve band 28 indicating curve information of the road where the travelling test is carried out is shown on the main screen 11.

Abstract: A running resistance device for a chassis dynamometer performs an environmental test while applying a running resistance and an environmental condition similar to a road running to the chassis dynamometer. Air-conditioning equipment, a thermometer and a barometer are provided in an environmental test laboratory. An air-conditioning control panel and a chassis-dynamometer control section are provided outside the environmental test laboratory.

Abstract: 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.

Abstract: [Object] Object of the present invention is to improve accuracy of the travelling test of a tested vehicle on a chassis dynamometer, and to increase realistic feeling of the travelling test. [Means to solve] A driver's aid device 5 displays, on a main screen 11, a travelling speed pattern 12 that is a driving pattern for performing a performance evaluation test of a tested vehicle 6. The main screen 11 displays thereon topographical feature information 13 of a road where the travelling test is carried out. A marker 14 that indicates a vehicle state is shown at an intersection of the topographical feature information 13 and a reference line 15 that indicates a present position of the tested vehicle 6. This marker 14 is shown with the marker 14 inclined in accordance with a gradient of the road where the test is carried out. Further, a curve band 28 indicating curve information of the road where the travelling test is carried out is shown on the main screen 11.

Abstract: In a running test, vehicle wheels are mounted on rollers. Each roller receives torque corresponding to the running resistance, which is a value corresponding to the running resistance applied to the vehicle on actual ground. The actual friction coefficient between the wheels and the rollers is calculated. The running resistance is corrected such that the actual friction coefficient becomes equal to the friction coefficient on actual ground that is calculated based on the slip ratio of the wheels with respect to the rollers. This approximates the running resistance applied to the vehicle by the rollers to the running resistance applied to the vehicle on actual ground as the torque is applied to the rollers in correspondence with the corrected running resistance. This prevents the drive force produced by the vehicle in the running test from becoming different than the drive force that is produced when running on actual ground.

Abstract: In a running test, wheels 2 of a vehicle 1 are mounted on rollers 3. Each roller 3 receives torque corresponding to the running resistance N, which is a value corresponding to the running resistance applied to the vehicle 1 on the actual ground. Further, in the test, the actual friction coefficient ?ch between the wheels 2 and the rollers 3 is calculated. The running resistance N is then corrected in such a manner that the actual friction coefficient ?ch becomes equal to the friction coefficient ?j on the actual ground that is calculated based on the slip ratio of the wheels 2 with respect to the rollers 3. This approximates the running resistance applied to the vehicle 1 by the rollers 3 to the running resistance applied to the vehicle 1 on the actual ground as the torque is applied to the rollers 3 in correspondence with the corrected running resistance N.