Contents of subjective evaluation of shift performance

Typical operating industrial control:

• Evaluate under different ambient temperature conditions, such as engine high temperature or low temperature environment, etc.;

• Evaluate under different transmission conditions, such as idle speed and driving conditions

• Upshift or downshift operation at a fixed engine speed point

• Sport driving mode or Comfort driving mode

Typical subjective evaluation characteristics:

• Force: selection, shift force level and characteristics; forward and return travel characteristics, viscous characteristics, limit characteristics, etc.;

• Stroke: select shift stroke, whether adjacent gears overlap, shift track consistency, gear identifiability

• NVH: Whether the gear is vibrating or making abnormal noises

• Overall performance: Shift stuck, gear accuracy, etc.

Shifting performance objective evaluation content

It mainly includes the following evaluation items:

• The engine is at a standstill (off). At this time, parameters such as shift force, shift stroke, gear position, etc. in the parking state are measured. This is mainly to evaluate the gear selection force, gear selection displacement, and idle travel of each gear under static conditions.

• Engine idle (standstill) state. It mainly measures the relevant performance of the shift control mechanism under the condition of idling and starts, and focuses on the parameter information such as the control force (synchronization force), impact force (secondary impact), and gear entry probability of the starting gear.

• Engine running (dynamic) state. Parameters such as shifting force, secondary shock, and synchronizing impulse of the main transmission under dynamic driving conditions. Focus on the comprehensive performance of the shifting system under the action of the gearbox.

Shift system composition

• 3D stroke measurement module

• 3D force measurement sensor

• Fixed bracket assembly

• Data acquisition module

• Data Analysis Module

Shift System Indicators

The system accuracy is as follows:

System basic functions

Supports various manual and automatic shifter types for measurement

Basic System Functions (Continued)

1. It can measure the manual shifter types of various gear types

• Support various manual gears and main and auxiliary box type shifters

• Software supports user-defined shifter modules

• The created template will be saved to the system library for future use

• Shifter acquisition data information is inherited from shifter template

  
  

2. It can measure the manual shifter types of various gear types

lift-up

push down

3. Data collection can be performed on various shifter planes

• Adapt to various shift plane measurements

• Shift planes can be entered manually and measured automatically

System software

1. Data acquisition software

The main interface of the current system data acquisition software is divided into manual gear and automatic gear modules.

2. It can conveniently and smoothly complete the collection, dynamic monitoring and saving of test data

• The software supports zero point calibration, and each channel can be set arbitrarily

• The collected signal curve has a real-time display function, and the curve color and line type can be arbitrarily defined by the user

• Process-guided operation, orderly guide the successful completion of the test

• Automatic collection of shifting dynamic performance data, intelligent judgment of gear position and eligibility factors

  
  

3. Data analysis software

The main interface of the current system software is divided into manual gear and automatic gear analysis modules. Each module establishes an independent analysis database.

4. Realize data processing, reporting and statistical analysis of the data collected by the test

• User-friendly and highly interactive data-assisted processing functions in Chinese, which can help users obtain key performance indicators from test data

• A variety of auxiliary tools help users perform chart operations. Support recipe map display.

• Automatic calculation of key analysis parameters to reduce human error

System functions

1. The system includes manual transmission and automatic transmission modules

Manual transmission module

• static gear position

• Gear clearance

• Gear track selection force and stroke

• Shift force and travel

• Inclined shift

• Idle start shift

• sport shift

• Shift in comfort

Automatic transmission module

• Gear position

• Gear clearance

• Shift force and travel

• Shifter stiffness

• Dynamic shifting

2. Gear clearance analysis (manual module)

The static gear position and gear clearance of each gear are analyzed, the holding ability of the gear position under no external force is investigated, the gear clarity of the vehicle is reflected, and the spatial symmetry of each gear is analyzed.

include:

• Static gear position (planar projection)

• Gear clearance

• H gate trajectory

  
  

3. Gear trajectory analysis (manual module)

Analyze the gear distribution characteristics, the smoothness of the transition between gears and the spatial symmetry. By looking at the force curve, it is possible to comprehensively determine whether the overall shift force distribution is uniform and to evaluate the quality of the shift feel.

Include:

static gear track

Dynamic Gear Trajectory

4. Gear selection displacement and force analysis (manual module)

The gear selection displacement and force analysis module mainly examines whether the curve of the gear selection process is smooth and clear, when the force of the locking pin is overcome, the resistance is gentle, and the left and right are symmetrical.

include:

• Gear selection stroke

• Gear selection process stiffness

• Gear selection force

• Gear selection hysteresis

• Gear selection system stiffness

• System Damping Characteristics

• Select Roughness

5. Gear selection displacement and force analysis (manual module)

Analyze the shifting force and shift displacement of each gear, reflect the clarity of the test gear, evaluate the characteristics of the locking pin and the shifting suction feeling, etc. By analyzing the shifting curve, it can reflect whether the characteristics such as the suction feeling and sensitive area reminder are obtained. In order to fully reflect, make an evaluation of the shifting clarity and shifting smoothness.

Include:

• Average maximum gear force

• Average maximum backshift force

• 5N corresponding stroke

• Maximum gear stroke

• Gear Rigidity

• Suction stiffness

• suction power

• Backshift stiffness

• Shift roughness

6. Analysis of oblique shift characteristics (manual module)

Mainly analyze the accuracy, guidance and smoothness of oblique shifting. Analyze the range and angle of the oblique passage of the shift lever, so as to judge whether the design of the bevel angle of the shift finger, the bevel angle of the shift fork and the bevel angle of the interlocking plate and the technological level meet the requirements.

Include:

• Oblique passing range

• Inbound and outbound trajectory offset

• Oblique motion track angle

• Select the shift stuck position

• Shift roughness

• Gear track consistency

• peak force

7. Idle start shift analysis (manual module)

Analyze the relative performance of the starting gear of the transmission control system under the condition of engine idling. Focus on its shifting force, maximum synchronizing force and secondary impact phenomenon. Determine the smoothness of the gear by its displacement and force curve.

Include:

• Shift sample number statistics

• File entry failure rate

• Average gear peak force

• Average back-off peak force

• Perceived secondary shock rate

• unacceptable secondary shock rate

8. Dynamic shift analysis (manual module)

Dynamic shift analysis is the main evaluation of vehicle shift system, and it is a comprehensive reflection of shift performance. It is mixed with the influencing factors of the shifting mechanism and the shifting information of the synchronization performance of the transmission. By measuring the shifting force and shifting displacement during the dynamic shifting process, the division of different shifting stages, shifting force, synchronization Analysis of impulse, secondary impact, etc., to evaluate the characteristics of shifting force and shifting impact under dynamic conditions, so as to judge the pros and cons of the comprehensive performance of dynamic shifting.

Include:

• maximum synchronizing force

• average synchronization force

• synchronizing impulse

• synchronised time

• Shift stroke impulse

• Secondary impact impulse

• secondary impact force

• Li ratio

• Synchronized traversal

• shift time

• total shift stroke

• …

9. Dynamic shift analysis continued (manual module)

The gear shift test is divided into static and dynamic tests. The dynamic test usually means that the function of the transmission (synchronizer) is added on the basis of the static test. For this reason, it is necessary to study the function of the transmission (synchronizer) separately.

In order to achieve its purpose, the average data generated by the statistical calculation of the static and dynamic data of the gear shifter are comprehensively compared and displayed, as shown in the following figure.

10. Static gear position analysis (automatic module)

The static position of each gear is analyzed, the distribution characteristics of gears are examined, and the arrangement of the shifting mechanism is evaluated based on ergonomics, whether it causes shifting fatigue, etc.

Include:

• Gear order

• gear absolute position

• gear relative position

11. Static gear gap analysis (automatic module)

Analyze the static clearance of each gear, examine the ability to maintain the gear position under the action of no external force, reflect the gear clarity of the vehicle, and examine the feel of the gear shift.

include:

• Gear selection to play

• shift to clearance

12. Gear clearance analysis (automatic module)

The shift force and stroke of the shift lever in the static state are analyzed to reflect whether the characteristics of the shift mechanism, such as suction and sensitive area reminders, have been fully reflected. This test reflects the gear clarity of the vehicle, evaluates the locking characteristics of the operating mechanism and the feeling of shifting suction.

Include:

• peak thrust position

• peak thrust

• Peak suction position

• peak suction

• maximum hysteresis

13. Gear clearance analysis continued (automatic module)

• Process thrust stiffness

• Process suction stiffness

• return thrust stiffness

• Return suction stiffness

14. Static shifter stiffness analysis (automatic module)

Analyze and evaluate the reliability of its shifting function. Measure the operating mechanism assembly clearance and the free play in the selection direction.

Include:

• Gear selection system stiffness

• System Damping Characteristics

15. Shift performance database management

The software provides a shift database management module to realize comprehensive management of shift test and analysis data. In this module, data of any vehicle model can be viewed and analyzed, and vehicle parameters can be extracted and compared according to relevant conditions.

Software function

Technical Support

Flexible service, fast response and reliable partner

• The same team of technology development and after-sales service is located in China, and can provide the fastest service response for Chinese customers

• Customized software development according to customer requirements

• Flexible combination sales of shift performance test modules and pedal performance test modules can be provided

Typical customers of the system (partly)