阅读说明：本技术 一种选择合适起步档的方法及系统 (Method and system for selecting proper starting gear ) 是由 程悦晓 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种选择合适起步档的方法及系统,属于商用车AMT应用领域。首先建立整车的起步阻力M-r和传动链速比I-(whole)对应的数据表,然后根据当前整车起步阻力M’,在数据表中选择对应的传动链速比I-(whole-request)；计算出基于I-(whole-request)的当前变速器的需求速比I-(GB-request),根据I-(GB-request),在速比列表中匹配出速比大于或等于I-(GB-request)的起步档范围,选择最小起步档作为当前起步档。本发明提出的一种选择合适起步档的系统,包括存储模块、选择模块、计算模块以及查找模块。本发明针对不同的车型,都可以自动选择一个更合适的起步档,用于调整整车的传动链速比,以实现更佳的起步性能。(The invention discloses a method and a system for selecting a proper starting gear, and belongs to the field of application of AMT (automated mechanical transmission) of commercial vehicles. Firstly, the starting resistance M of the whole vehicle is established r And transmission chain speed ratio I whole Selecting a corresponding transmission chain speed ratio I from the data table according to the current vehicle starting resistance M' of the whole vehicle whole_request (ii) a Is calculated on the basis of I whole_request Is required of the current transmission GB_request According to I GB_request Matching a speed ratio greater than or equal to I in the speed ratio list GB_request The minimum starting gear is selected as the current starting gear. The invention provides a system for selecting a proper starting gear, which comprises a storage module,The device comprises a selection module, a calculation module and a search module. The invention can automatically select a more proper starting gear for adjusting the transmission chain speed ratio of the whole vehicle aiming at different vehicle types so as to realize better starting performance.)

1. A method of selecting a suitable starting gear comprising the steps of:

step 1: establishing starting resistance M of whole vehicle_rAnd transmission chain speed ratio I_wholeA corresponding data table, wherein the value of r is {1,2, …, N };

step 2: detecting the current starting resistance of the whole vehicle as M', and M_r＜M'＜M_r+1Then according to the data table of step 1, selecting M_rCorresponding transmission chain speed ratio I_{whole_request}

And step 3: to obtain a base based on I_{whole_request}Is required of the current transmission_{GB_request}Comprises the following steps:

wherein, GaRadHeb is the rolling radius of the tire;

and 4, step 4: i obtained according to step 3_{GB_request}Matching a speed ratio greater than or equal to I in the speed ratio list_{GB_request}The minimum starting gear is selected as the current starting gear.

2. A method of selecting a suitable starting gear according to claim 1, characterized in that in step 1:

starting resistance M of whole vehicle_rComprises the following steps:

M_r＝M+M*Pin；

wherein M is the vehicle weight, and Pin is the gradient;

speed ratio I of transmission chain of whole vehicle_wholeComprises the following steps:

wherein Es is the engine speed, Rt is the rolling radius of the tire, and Sfa is the wheel speed signal of the ABS.

3. A method of selecting a suitable starting gear according to claim 2, characterised in that a gradient sensor is provided to detect the current vehicle gradient Pin in real time.

4. A method of selecting a suitable starting gear according to claim 1, characterised in that in the list of speed ratios in step 4, different speed ratios correspond to different starting gears.

5. A system for selecting a proper starting gear is characterized by comprising a storage module, a selection module, a calculation module and a search module;

the storage module stores the starting resistance M of different vehicles_rAnd corresponding transmission chain speed ratio I_whole(ii) a In the selection module, according to the current vehicle starting resistance M', the corresponding transmission chain speed ratio I is selected in the storage module_{whole_request}(ii) a In the calculation module, the calculation is based on I_{whole_request}Is required of the current transmission_{GB_request}(ii) a In the searching module, according to I output by the computing module_{GB_request}Finding a speed ratio greater than or equal to I in the speed ratio list_{GB_request}And taking the corresponding minimum starting gear as the current starting gear.

6. A system for selecting a suitable starting gear according to claim 5, which is fitted in a controller system of a commercial vehicle.

Technical Field

The invention relates to the field of AMT (automated mechanical transmission) application of commercial vehicles, in particular to a method and a system for selecting a proper starting gear.

Background

The application range of the commercial vehicle is extremely wide and complex, the configuration of the commercial vehicle is rich, the rear axle speed ratio of the tractor and the speed ratio of the matched speed changer are different, and the starting comfort of the automatic transmission vehicle can be greatly improved by selecting a proper starting gear.

At present, the application field of the AMT is basically focused on gear selection of a transmission, other factors which can influence the speed ratio of a transmission chain, such as the speed ratio of a rear axle, the radius of tires and the like are not considered, and the starting gear cannot be timely adjusted according to the speed ratio of the transmission chain except a gearbox, the weight of a vehicle, the gradient and the like.

Disclosure of Invention

The invention aims to provide a method and a system for selecting a proper starting gear, which can control a vehicle to start in a proper speed ratio interval according to different working conditions, provide better starting performance, have reasonable design, overcome the defects of the prior art and have good effect.

In order to achieve object 1 of the present invention, a method for selecting a suitable starting gear is proposed, comprising the steps of:

step 1: establishing starting resistance M of whole vehicle_rAnd transmission chain speed ratio I_wholeCorresponding data table, wherein the value of r is {1,2, …, N }, and different starting resistances M in the data table_rCorresponding to different transmission chain speed ratios I_whole；

Step 2: detecting the current starting resistance of the whole vehicle as M', if M_r＜M'＜M_r+1Then according to the data table of step 1, selecting M_rA corresponding drive chain speed ratio;

and step 3: to obtain a base based on I_{whole_request}Is required of the current transmission_{GB_request}Comprises the following steps:

wherein, GaRadHeb is the rolling radius of the tire;

and 4, step 4: i obtained according to step 3_{GB_request}Matching a speed ratio greater than or equal to I in the speed ratio list_{GB_request}The minimum starting gear is selected as the current starting gear.

Preferably, in step 1:

starting resistance M of whole vehicle_r：

M_r＝M+M*Pin；

Wherein M is the vehicle weight, and Pin is the gradient;

speed ratio I of transmission chain of whole vehicle_whole：

Wherein Es is the engine speed, Rt is the rolling radius of the tire, and Sfa is the wheel speed signal of the ABS.

Preferably, a gradient sensor is arranged for detecting the current finished automobile gradient Pin in real time.

Preferably, in the speed ratio list in step 4, different speed ratios correspond to different starting gears.

In order to realize the aim 2 of the invention, a system for selecting a proper starting gear is provided, which comprises a storage module, a selection module, a calculation module and a search module;

preferably, the storage module stores the starting resistance M of different vehicles_rAnd corresponding transmission chain speed ratio I_whole(ii) a In the selection module, according to the current vehicle starting resistance M', the corresponding transmission chain speed ratio I is selected in the storage module_{whole_request}(ii) a In the calculation module, the calculation is based on I_{whole_request}Is required of the current transmission_{GB_request}(ii) a In the search module, according to I output by the calculation module_{GB_request}Finding a speed ratio greater than or equal to I in the speed ratio list_{GB_request}And taking the corresponding minimum starting gear as the current starting gear.

The system is preferably fitted in a controller system of a commercial vehicle.

The beneficial and technical effects brought by the invention are as follows:

aiming at different vehicle types, a more proper starting gear can be automatically selected for adjusting the transmission chain speed ratio of the whole vehicle so as to realize better starting performance.

Drawings

FIG. 1 is a schematic flow chart of a method and system for selecting a suitable starting gear according to the present invention;

Detailed Description

To facilitate understanding and practice of the invention by those of ordinary skill in the art, embodiments of the invention are further described below with reference to the accompanying drawings and specific examples:

a method of selecting a suitable starting gear comprising the steps of:

step 1: establishing starting resistance M of whole vehicle_rAnd transmission chain speed ratio I_wholeA corresponding data table, wherein the value of r is {1,2, …, N }; different starting resistances M in the data sheet_rCorresponding to different transmission chain speed ratios I_whole；

Starting resistance M of whole vehicle_r：

M_r＝M+M*Pin；

Wherein M is the vehicle weight, and Pin is the gradient;

speed ratio I of transmission chain of whole vehicle_whole：

Wherein Es is the engine speed, Rt is the rolling radius of the tire, and Sfa is the wheel speed signal of the ABS.

According to the calculated starting resistance M of the whole vehicle_rAnd transmission chain speed ratio I_wholeThe following data table was established:

Mr

M1

M2

M3

M4

M5

M6

M7

M8

Iwhole_request

I1

I2

I3

I4

I5

I6

I7

I8

M1-M8, I1-I8, all of which are calibratable.

Step 2: detecting the current starting resistance of the whole vehicle as M', if M₁＜M'＜M₂Then, according to the data table of step 1, M is selected₁A corresponding drive chain speed ratio;

and step 3: to obtain a base based on I_{whole_request}Is required of the current transmission_{GB_request}Comprises the following steps:

wherein, GaRadHeb is the rolling radius of the tire;

and 4, step 4: according to step 3, obtained_{GB_request}Matching a speed ratio greater than or equal to I in the speed ratio list_{GB_request}Starting gear range ofAnd selecting the minimum starting gear as the current starting gear.

For example, a vehicle equipped with a 16-speed transmission, and calculating I_{GB_request}Matching gears with the speed ratio larger than or equal to 8 in the following speed ratio list, finding and comparing to obtain that the 3 gear is the minimum speed ratio gear with the speed ratio larger than 8, and selecting the 3 gear as the current starting gear of the vehicle.

The list of speed ratios is as follows:

gear position	1st	2nd	3rd	4th	5th	6th	7th	8th	9th	10th	11th	12th	13th	14th	15th	16th
																	Speed ratio	13.12	11.05	9.17	7.72	6.3	5.3	4.38	3.68	3	2.52	2.1	1.76	1.44	1.21	1	0.84

A system for selecting a proper starting gear is shown in figure 1 and comprises a storage module, a selection module, a calculation module and a search module;

specifically, the storage module stores the starting resistance M of different vehicles_rAnd corresponding transmission chain speed ratio I_whole(ii) a In the selection module, according to the current vehicle starting resistance M', the corresponding transmission chain speed ratio I is selected in the storage module_{whole_request}(ii) a In the calculation module, the calculation is based on I_{whole_request}Is required of the current transmission_{GB_request}(ii) a Check theIn the searching module, according to I output by the computing module_{GB_request}Finding a speed ratio greater than or equal to I in the speed ratio list_{GB_request}And taking the corresponding minimum starting gear as the current starting gear.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.