| CPC G06F 30/15 (2020.01) [G07C 5/02 (2013.01)] | 9 Claims |
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1. A steady-state site driving condition development method to carry out vehicle driving range tests based on a transient-state driving condition, comprising:
S1. fragmenting a chassis drum transient-state driving condition expressed as a laboratory chassis drum transient-state speed-time curve by a short-range method to obtain transient-state motion segments;
S2. pretreating the fragmented transient-state motion segments to obtain a minimum speed of the pretreated transient-state motion segments, and fragmenting the transient-state motion segment that is not pretreated with reference to coordinates corresponding to the minimum speed to obtain a plurality of transient-state sub-motion segments;
S3. merging the transient-state sub-motion segments meeting merging requirements according to maximum speeds and durations of the transient-state sub-motion segments, and recording maximum speeds and durations of merged transient-state motion segments formed by combining the non-merged transient-state sub-motion segments and the merged transient-state sub-motion segments;
S4. calculating maximum constant speeds under a steady-state driving condition based on the maximum speeds of the transient-state sub-motion segments, and calculating mean accelerations and mean decelerations of steady-state motion segments;
S5. converting acceleration and deceleration processes of the transient-state sub-motion segments into uniform acceleration and uniform deceleration processes according to the maximum constant speeds, calculating acceleration durations and deceleration durations of the steady-state motion segments, calculating constant speed durations according to a total duration of the steady-state motion segments, and finally obtaining the steady-state motion segment corresponding to each transient-state sub-motion segment; and
S6. sequentially connecting a plurality of steady-state motion segments according to time axes, inserting idle segments with fixed durations between the steady-state motion segments and at the beginning and end of a steady-state driving condition, and finally developing a steady-state site test driving condition based on the chassis drum transient-state driving condition, and utilizing the steady-state site test driving condition to carry out the vehicle driving range tests on a test site, thus providing a unified test driving condition for enterprises to carry out vehicle range tests on the test site with the laboratory chassis drum transient-state driving condition through the development of the steady-state site test driving condition;
wherein before testing the vehicle after obtaining the steady-state site test driving condition, the vehicle to be tested is required to be pretreated to reach a state required by the test, followed by carrying out the test; firstly vehicle tires are replaced with snow tires or high-temperature-resistant tires, and tire pressure is adjusted; and after adjustment is finished, a discharge is carried out at a temperature of 23° C.+/−3° C. and a constant speed of 120 km/h in a laboratory environment cabin and then stops until a remaining battery power displayed on a vehicle's dashboard is 0; secondly, the vehicle is charged in the environmental cabin until a charging pile or the vehicle's dashboard indicates that the charging is completed, wherein the temperature of the environmental cabin is set to be the average temperature of a local garage during charging at 10° C.; and then, the fully charged vehicle is placed in a vehicle dipping room for vehicle dipping, wherein the vehicle dipping temperature is consistent with the average temperature of the local garage at 10° C., and a vehicle dipping time is not less than 8 hours; and before the test begins, a V-BOX smart vehicle-mounted terminal is installed on the vehicle to be tested, which is configured to collect a driving speed of the vehicle; a setting of an air conditioner of the vehicle is consistent with the range test method during a driving process; and for an test duration exceeding 6 hours, the driver operates the vehicle by turns every 6 hours until the vehicle's dashboard displays the remaining battery power as 0, the test is ended.
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