Method for analog computation and detection of road test fuel consumption of vehicle in multiple working conditions

Abstract

The invention provides a method for analog computation and detection of the road test fuel consumption of a vehicle in multiple working conditions. According to the method, the rolling resistance and the air resistance of each speed of the vehicle of a new type are calculated according to the rolling resistance coefficient equation and the air resistance coefficient equation of the type of the vehicle, the consumption torque and the acceleration resistance of an engine accessory are worked out, and then the output power, the torque and the rotating speed of an engine at each speed of the vehicle in the constant speed working condition and in the acceleration working condition can be obtained; the fuel consumption in the multiple working conditions is worked out according to the specific fuel consumption corresponding to the universal characteristic curve of the engine, the dynamic power fuel consumption is compensated for through calculation according to a high drive power within a vehicle speed section, the drive power is higher within a section with a quite low initial speed, so that the output power of the engine is in the stable state, the fuel consumption in the deceleration working condition is determined according to the relation between the engine rotating speed and the idling cut-off rotating speed, and the fuel consumption in the idling condition is worked out according to the idling fuel parameters of the engine; in this way, the fuel consumption or exhaust emission of road tests in the multiple working conditions is automatically worked out.

Description

technical field [0001] Fuel consumption simulation calculation method for multi-working condition road test of automobiles. No road test or bench test is required for the new models inspected. The constant speed, acceleration, and deceleration are calculated based on the relevant technical parameters of the vehicle according to the air resistance coefficient equation and rolling resistance coefficient equation of the vehicle category. The invention relates to a detection method of fuel consumption or exhaust gas emission in multi-working condition road test at idling speed, belonging to the technical field of automobile performance detection methods. Background technique [0002] Existing technology detects the fuel consumption of new models in multi-working condition road tests, usually according to the national standard GB / T12545.2-2001 "Commercial Vehicle Fuel Consumption Test Method" and GB / T27840-2011 "Heavy Commercial Vehicle Fuel Consumption Measurement Method" 》, to ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) The running-in cost of the road test and bench test is high, and the inspection time is long

(3) The calculation method does not classify the body type and put C D The error of the fixed value is relatively large, and the error of estimating the equivalent inertia of the rotating parts of the low-speed gear is too large

(4) Bench tests and calculation methods do not have standardized gears, and the operability of gears is very poor. It is difficult to calculate the torque margin rate per second when the vehicle speed is very low under acceleration conditions.

(5) Bench test is difficult to simulate the inertial acceleration resistance of a fully loaded heavy vehicle

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