Innovative clutch analysis for trouble-free gear shifting

Some NVH (noise, vibration, harshness) phenomena are influenced directly or indirectly by the clutch. The clutch can pull up. That means that unexpected vibrations occur in the drivetrain. Or the axles squeal. The clutch analysis (CA) system can be used to identify these kinds of possible issues with the vehicle while it is in the early stages of development.

Analyse, identify, and eliminate problems that arise

atesteo_bild_k-analyseThe CA system (clutch analysis system) was developed by ATESTEO for objective analysis of the clutch mechanism and the clutch hydraulics in vehicles with manual transmissions. The clutch analysis system is used in both vehicles and test benches.

The clutch analysis system (CA) supports doing the following:

  • Comparing vehicles
  • Comparing vehicle concepts (competitors, design, suppliers’ products)
  • Comparing development phases (design iteration)
  • Comparing various production lines
  • Comparing durability- and temperature-dependent influences
  • Comparing subjective evaluations using objective characteristic values
  • Improving clutch behaviour and operability

Custom clutch analysis for customer-specific requirements

The basis for the evaluation is the pedal forces and distances at the clutch pedal. In addition, temperatures and engine speed can be measured at the same time for more detailed analyses. The clutch analysis system includes the entire hard and software for recording, viewing, and analysing the necessary data. The measurement tasks and the measurement values can generally be adapted to meet customer wishes.

The three components of the CA system:

The clutch analysis CA measurement hardware

The measurement hardware includes a pedal force sensor and a cable-pull potentiometer. The actuation forces clutching distances are measured using these two basic sensors. In addition, temperature and rotational speed sensors can also be integrated into the system.

The clutch analysis (CA) measurement device

The data of the entire sensor system is processed into high-quality measurement values using a measurement device from the Imc company. The combined sampling rate is 400 kHz. The Imc devices sold with the GSA system are compatible with the clutch analysis (CA) system.

The clutch analysis (CA) software

The measurement data are recorded and analysed using the clutch analysis (CA) software. At the same time, the program guides the user through the entire measurement procedure. After the recording of the characteristic hysteresis curves, further defined clutching points are travelled to and measured. All data is stored as a project.

The clutch analysis (CA) software can do the following:

  • In the analysis mode of the software, measurements can be loaded, depicted, and processed and analysed. The clutching positions measured by the software can be offset if required.
  • Additional, user-defined clutching positions can be measured out manually.
  • The multiple analyses offer the option of comparing any number of measurements.
  • Multiple clutching curves can be averaged.
  • An option is available for storing the results as PDF, Word, or Excel documents or as websites.
  • Additional analysis methods are available to the user through export into Excel in CSV format.
  • The pure measurement data are stored in RAW format and can be viewed and analysed using the Famos program from the Imc company.

Compatibility and adaptability of the clutch analysis (CA) software:

The CA software is an ATESTEO in-house development. As a rule, the applications can be adapted to customer wishes. The target systems are Windows XP and Windows 7. No further software subject to licensing requirements is needed. The clutch analysis (CA) system is generally sold in conjunction with the GSA gear shift analysis system as a particularly effective combination.