An indirect measurement device and calibration method for vehicle operating condition parameters

Abstract

The invention discloses an indirect measuring apparatus for a vehicle operation status parameter and a calibration method. The operation status parameter includes a brake power. The apparatus includes: a chassis dynamometer, a fender pile, and a drawing force transducer. The calibration method includes the following steps: parking a vehicle on a rotary drum of the chassis dynamometer of the vehicle; connecting a hydraulic sensor to a wheel cylinder oil pipe; starting the vehicle and accelerating the vehicle to 70 km / h; treading a brake pedal to a half position; calculating an indirect measuring result of the vehicle operation status parameter on the basis of the chassis dynamometer of the vehicle and the drawing force transducer; comparing the indirect measuring result with the wheel cylinder oil pressure; and on the basis of a comparing result, calibrating the indirect measuring. According to the invention, the apparatus and the method are suitable to use the chassis dynamometer to conduct calibration on indirect measuring of the vehicle brake power and make an accurate indirect measuring result. The apparatus and the method guarantee measure parameters through the chassis dynamometer and solve the vehicle brake power, and at the same time guarantee similarity between indirect measuring precision and direct measuring precision, and greatly increase convenience and effectiveness in measuring the vehicle brake power.

Description

technical field [0001] The invention relates to the field of vehicle operation condition parameter measurement, in particular to an indirect measurement device and calibration method for vehicle operation condition parameters. Background technique [0002] Automobile operating parameters are closely related to the operating safety of the automobile, including parameters such as braking force. In 2015, the number of automobiles in my country reached 172 million. A large number of automobile accidents are caused by substandard braking force, especially for cargo transport vehicles, because the accidents caused by them often cause significant personnel and economic losses. Therefore, more attention should be paid to Focus on braking force testing. [0003] Patent 201410578676.9 uses an acceptance module and a judgment module to detect whether there is a problem with vehicle braking, but does not mention the detection module, and only uses a certain direct measurement method to ...

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Problems solved by technology

[0003] Patent 201410578676.9 uses an acceptance module and a judgment module to detect whether there is a problem with vehicle braking, but does not mention the detection module, and only uses a certain direct measurement method to diagnose the rationality and mutual synchronization of the vehicle brake signal and the master cylinder pressure signal , did not make requirements for the measurement scene, such as whether a dynamometer is needed; patent 201510028605.6 uses a vehicle model without powertrain and the powertrain on the basic bench module to form a half-physical virtual vehicle, and uses the status information of the powertrain unit Calculate the resistance torque with the road condition information output by the road model and realize it by the dynamometer. Although the patent uses a dynamometer, it is only used to simulate the vehicle, and cannot effectively measure the operating condition parameters of the real vehicle, and cannot measure the entire vehicle. ;Patent 201410384563.5 calculates the braking torque based on the brake pedal displacement signal, although there is a certain relationship between the brake pedal displacement and the braking torque, but because the height of the brake pedal of each vehicle is adjustable, and the two vehicles of different brands and models The relationship is not necessarily the same, so it is necessary to calibrate each vehicle

[0004] At present, the chassis dynamometer has been widely used in the inspection and maintenance of vehicles, but the chassis dynamometer can not fully reflect the braking force of the vehicle, nor is it used in the indirect measurement of these parameters. How to use the chassis dynamometer to indirectly measure the parameters to calculate The braking force of the vehicle, so as to accurately obtain the actual operating condition parameters of the vehicle, so as to effectively avoid the vehicle safety accidents caused by the substandard braking force. The technology in this area has not been developed yet.

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