Road test method for driving range of light automobile

Abstract

The invention discloses a light vehicle driving range road test method, which mainly comprises the following steps: determining a test route based on a real road and preparing a test vehicle based on the analysis of a set vehicle driving condition standard; after the test is started, setting a running mode and an air-conditioning mode of the tested vehicle, and driving the tested vehicle back and forth on the collected test route; and continuously collecting the driving mileage of the vehicle in the driving process, and recording the current mileage information as the driving mileage according to different vehicle types when the tested vehicle drives to a preset working condition node. The test route collected by the test is close to the set working condition standard to the greatest extent and fits the real vehicle use scene of the user, so that the test result can truly reflect the vehicle use condition on one hand, and provides high-quality data support for designers on the other hand, and the test efficiency is improved. For example, road test results and laboratory or simulation results can be compared and analyzed to optimize the design.

Description

Technical Field

[0001] The invention relates to the technical field of automobile testing, and in particular to a road testing method for the driving range of a light automobile. Background Art

[0002] For a long time, car driving range has been an indicator that users are more concerned about. Especially in recent years, with the popularization of new energy vehicles, the car's driving range in different environments has become more and more the focus of users.

[0003] At present, the driving range of automobiles is mostly tested in the laboratory on chassis dynamometers, and there are also simulation software to output the driving range results of automobiles. The test conditions are mostly NDEC conditions and CLTC conditions. However, whether the results tested in the laboratory or the results output through simulation, there is often a large gap between the actual driving range of users.

[0004] The present invention has analyzed and believed that the main reason is that the test in the laboratory or simulation is completely carried out according to the ideal working conditions and test boundaries, while in the actual use of the vehicle, the environment, working conditions, etc. are far from the ideal working conditions. Specifically, the driving range announced by the car is obtained by testing in the laboratory with the chassis dynamometer under the NEDC or CLTC working conditions and under the ideal ambient temperature. There is a large gap between the environmental conditions when the user actually uses the car and it cannot truly reflect the actual driving range of the car. Summary of the invention

[0005] In view of the above, the present invention aims to provide a road test method for the driving range of a light vehicle to solve the problem that the results measured in the laboratory or by simulation cannot truly reflect the actual driving range of the vehicle.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention provides a road test method for a light vehicle's driving range, which includes:

[0008] Determine the test route based on real roads based on the analysis of established vehicle driving condition standards;

[0009] Prepare the vehicle for testing, including: mass loading and refueling or charging according to the standard according to the vehicle model, and let it stand after refueling or charging;

[0010] After the test begins, set the operating mode and air conditioning mode of the test vehicle and drive back and forth on the test route;

[0011] The vehicle mileage is continuously collected during driving, and when the test vehicle reaches the preset working condition node, the current mileage information is recorded as the driving range, including:

[0012] When the hybrid vehicle is driving until the engine is started, the mileage traveled is the hybrid vehicle's pure electric driving range; and when the fuel warning light is on, the mileage traveled is the hybrid vehicle's full fuel and full battery driving range;

[0013] When a fuel-powered vehicle is driven until the fuel warning light comes on, the mileage it has traveled is the cruising range.

[0014] When the pure electric vehicle travels until the power limit reaches the corresponding established threshold standard and the maximum speed decays to the corresponding established threshold standard, the current mileage is the cruising range.

[0015] In at least one possible implementation, the analysis includes: analyzing mileage distribution ratios for different speed levels in a preset light vehicle driving condition standard.

[0016] In at least one possible implementation, the determination of the test route based on the real road includes: according to the analysis result of the mileage distribution ratio, selecting actual roads of different highway grades as the test route, and the mileage distribution ratio, average vehicle speed and maximum vehicle speed of each test route are all less than or equal to 3% from the standard value in the light vehicle driving condition.

[0017] In at least one possible implementation, the mass loading includes: before the test begins, the test vehicle is loaded with mass, and the loaded mass is the sum of a preset reference mass, an optional equipment mass, and a preset representative compliance mass.

[0018] In at least one possible implementation, refueling or charging according to the standard according to the vehicle model includes:

[0019] For fuel vehicles, the fuel gun will jump at least three times as a sign of full fuel;

[0020] Pure electric vehicles and hybrid vehicles use slow charging mode to charge the vehicle. When the on-board or external instrument displays information indicating that charging has been completed, it is determined that charging is complete.

[0021] In at least one possible implementation, the standing still includes: after refueling or charging is completed, the position of the vehicle is kept unchanged, and the vehicle is allowed to stand still for a preset period of time at a preset temperature value, and the temperature value is set based on different test environment temperatures.

[0022] In at least one possible implementation, the operating mode includes:

[0023] Hybrid vehicles use the model's pre-configured economy mode, battery conservation is set to the model's pre-configured minimum mode, and energy recovery is set to the model's pre-configured standard mode;

[0024] Pure electric vehicles use the model's pre-configured economy mode, and energy recovery is set to the model's pre-configured standard mode;

[0025] Fuel vehicles use the economy mode pre-configured for the vehicle model.

[0026] In at least one possible implementation, the road test method further includes: refueling or charging the vehicle when it reaches the operating condition node, and recording the amount of refueling or charging when the vehicle is fully refueled or charging is completed, for calculating fuel consumption or electricity consumption.

[0027] Compared with the prior art, the main design concept of the present invention is to include: based on the analysis of the established automobile driving condition standards, determine the test route based on the real road and prepare the test vehicle; after the test starts, set the operating mode and air-conditioning mode of the test vehicle, and drive back and forth on the collected test route; continuously collect the vehicle mileage during driving, and when the test vehicle drives to the preset working condition node, record the current mileage information as the driving range according to different models. By conducting tests on actual roads, using the user's actual vehicle usage scenarios and real working conditions, a more accurate driving range can be obtained. The test route collected by the test of the present invention is as close to the established working condition standards as possible, and at the same time fits the user's real vehicle usage scenario. The test results measured in this way can truly reflect the vehicle usage on the one hand, and on the other hand, provide high-quality data support for designers, for example, the road test results can be compared and analyzed with the laboratory or simulation results to optimize the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0029] Figure 1 A schematic diagram of a light vehicle driving range road test method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0031] The present invention proposes an embodiment of a road test method for a light vehicle driving range. Specifically, Figure 1 shown, including:

[0032] Step S1, determining a test route based on a real road based on an analysis of a predetermined automobile driving condition standard;

[0033] It should be pointed out here that the scheme of the present invention can involve testing in high-cold, high-temperature and normal-temperature areas. The following text will mainly take high-cold areas as an example to introduce in detail the embodiment of the light vehicle range road test method.

[0034] Specifically, based on the established light vehicle driving conditions, such as the CLTC conditions (CLTC-P is applicable to M1 vehicles, and CLTC-C is applicable to N1 and M2 vehicles with a maximum design gross mass not exceeding 3500kg), the mileage distribution ratios of the three parts of low speed (part 1), medium speed (part 2) and high speed (part 3) in the vehicle driving condition standard are analyzed, and in high-altitude and cold areas, such as Heihe City (and other cities), cities, general roads and highways are selected as test routes respectively, and the mileage distribution ratio, average speed, maximum speed, etc. of each test route shall not deviate from the aforementioned established conditions by more than 3%, in order to maximize the proximity to the CLTC conditions, and the city, general road and highway are set as one test cycle.

[0035] Step S2, preparing the test vehicle, including: mass loading and refueling or charging according to the standard according to the vehicle model, and letting it stand after refueling or charging;

[0036] To elaborate, before the test officially begins, the test vehicle is loaded according to the preset requirements. The loaded mass is the sum of the preset baseline mass, the optional equipment mass, and the representative compliance mass. The test vehicle also needs to be refueled / charged.

[0037] The refueling standard is: fill up, and the gun jumps at least three times as the fuel is full; the charging standard is: pure electric vehicles and hybrid vehicles use slow charging to charge the vehicle, and when the on-board or external instrument displays information indicating that charging is completed, it is determined to be charging completed. Here, another situation is taken into account during implementation. If the on-board or external instrument sends an obvious signal indicating that the REESS (Rechargeable Energy Storage System) is not full, in this case, the maximum charging time is set to: 3×REESS energy (kWh) / power supply power (kW) specified by the automobile manufacturer.

[0038] After refueling / charging is completed, keep the vehicle in the same position (i.e. do not move the vehicle), and let the vehicle stand at (-20±3)℃ (this value is an example of the test environment temperature in high-cold areas. For high-temperature and normal-temperature areas, it can be set to 25±3℃ and 40±3℃ respectively. Of course, other specified temperatures can also be used) for at least 10 hours (adjustable) before starting subsequent tests.

[0039] Step S3: After the test starts, the operating mode and air conditioning mode of the test vehicle are set, and the test vehicle is driven back and forth on the test route;

[0040] The operating mode in this link can be expanded as follows:

[0041] Hybrid vehicles use the economy mode pre-configured for the vehicle model, the battery conservation setting is the lowest mode pre-configured for the vehicle model (such as smart lowest), and the energy recovery setting is the standard mode pre-configured for the vehicle model;

[0042] Pure electric vehicles use the model's pre-configured economy mode, and energy recovery is set to the model's pre-configured standard mode;

[0043] Fuel vehicles use the economy mode pre-configured for the model;

[0044] The air conditioning settings for the above-mentioned different models can be referred to as follows: the air conditioning is turned on at 22°C and AUTO mode (this is the high-cold area mode in the current example, the high-temperature area can be set to 25°C and AUTO, and the air conditioning can be turned off in normal temperature areas; of course, the above parameters can also be changed as needed).

[0045] Afterwards, the vehicle is driven back and forth along the collected cyclic test route, and normal operations are performed during driving, that is, special operating conditions such as stepping on the accelerator hard need to be avoided.

[0046] Step S4: continuously collect vehicle mileage during driving, and when the test vehicle reaches a preset operating condition node, record the current mileage information as the continuous driving mileage.

[0047] During driving, the vehicle driving information can be recorded by connecting to a data collector. And the driving range can be determined in the following way based on different vehicle models.

[0048] When the hybrid vehicle is driven until the engine starts, the mileage is the pure electric driving range of the vehicle; when the fuel warning light comes on, the mileage is the full fuel and full battery driving range of the vehicle;

[0049] When a fuel-powered vehicle is driven until the fuel warning light comes on, the mileage traveled is the vehicle's range.

[0050] When a pure electric vehicle's power is significantly limited and its maximum speed is significantly reduced (which can be assessed based on a quantifiable threshold), the mileage traveled at this time is the vehicle's cruising range.

[0051] Finally, it can be added that when the vehicle reaches the above-mentioned operating condition node, it can refuel / charge at the nearest gas station or charging station. The requirements for refueling and charging are the same as the methods before the aforementioned test, which will not be repeated here. The amount of refueling or charging at this time is then recorded to calculate the fuel consumption or electricity consumption.

[0052] In summary, the main design concept of the present invention is to include: based on the analysis of the established automobile driving condition standards, determine the test route based on the real road and prepare the test vehicle; after the test starts, set the operating mode and air-conditioning mode of the test vehicle, and drive back and forth on the collected test route; continuously collect the vehicle mileage during driving, and when the test vehicle drives to the preset working condition node, record the current mileage information as the driving range according to different models. By conducting tests on actual roads, using the user's actual vehicle usage scenarios and real working conditions, a more accurate driving range can be obtained. The test route collected by the test of the present invention is as close to the established working condition standards as possible, and at the same time fits the user's real vehicle usage scenario. The test results measured in this way can truly reflect the vehicle usage on the one hand, and on the other hand, provide high-quality data support for designers, for example, the road test results can be compared and analyzed with the laboratory or simulation results to optimize the design.

[0053] If the expressions expressing orientation are mentioned in the embodiments of the present invention, they are relative concepts based on the embodiments. In addition, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, c can be single or multiple.

[0054] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A road test method for the driving range of a light vehicle, characterized in that: include: Determine the test route based on real roads based on the analysis of established vehicle driving condition standards; Prepare the vehicle for testing, including: mass loading and refueling or charging according to the standard according to the vehicle model, and let it stand after refueling or charging; After the test begins, set the operating mode and air conditioning mode of the test vehicle and drive back and forth on the test route; The vehicle mileage is continuously collected during driving, and when the test vehicle reaches the preset working condition node, the current mileage information is recorded as the driving range, including: When the hybrid vehicle is driving until the engine is started, the mileage traveled is the hybrid vehicle's pure electric driving range; and when the fuel warning light is on, the mileage traveled is the hybrid vehicle's full fuel and full battery driving range; When a fuel-powered vehicle is driven until the fuel warning light comes on, the mileage it has traveled is the cruising range. When the pure electric vehicle travels until the power limit reaches the corresponding established threshold standard and the maximum speed decays to the corresponding established threshold standard, the current mileage is the cruising range.

2. The light vehicle driving range road test method according to claim 1, characterized in that: The analysis includes: analyzing the mileage distribution ratio of different speed levels in the preset light vehicle driving condition standard.

3. The light vehicle driving range road test method according to claim 2, characterized in that: The determination of the test route based on the real road includes: selecting actual roads of different highway grades as the test route according to the analysis result of the mileage distribution ratio, and the mileage distribution ratio, average vehicle speed and maximum vehicle speed of each test route are all less than or equal to 3% of the deviation from the standard value in the light vehicle driving condition.

4. The light vehicle driving range road test method according to claim 1, characterized in that: The mass loading includes: before the test begins, the test vehicle is loaded with mass, and the loaded mass is the sum of a preset reference mass, an optional equipment mass, and a preset representative compliance mass.

5. The light vehicle driving range road test method according to claim 1, characterized in that: The standard refueling or charging according to the vehicle model includes: For fuel vehicles, the fuel gun will jump at least three times as a sign of full fuel; Pure electric vehicles and hybrid vehicles use slow charging mode to charge the vehicle. When the on-board or external instrument displays information indicating that charging has been completed, it is determined that charging is complete.

6. The light vehicle driving range road test method according to claim 1, characterized in that: The stationary state includes: after refueling or charging is completed, the position of the vehicle is kept unchanged, and the vehicle is allowed to stand for a preset time at a preset temperature value, and the temperature value is set based on different test environment temperatures.

7. The light vehicle driving range road test method according to claim 1, characterized in that: The operating modes include: Hybrid vehicles use the economy mode pre-configured for the vehicle model, the battery conservation setting is the lowest mode pre-configured for the vehicle model, and the energy recovery setting is the standard mode pre-configured for the vehicle model; Pure electric vehicles use the model's pre-configured economy mode, and energy recovery is set to the model's pre-configured standard mode; Fuel vehicles use the economy mode pre-configured for the vehicle model.

8. The light vehicle driving range road test method according to any one of claims 1 to 7, characterized in that: The road test method also includes: refueling or charging the vehicle when it reaches the operating condition node, and recording the amount of refueling or charging when the vehicle is fully refueled or fully charged, for calculating the fuel consumption or power consumption.

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