Gear-shift control
Gear-shift control
Gear-shifting applications
Context
Electronically controlled transmissions offer major benefi ts in terms of driving comfort, safety and fuel economy. The electronic control systems that calculate optimum gear ratios and control gear engagement rely on sensors to provide the input information they need to perform their calculations.
In today's automatic transmissions and recent automated manual (AMT) and dual clutch
(DCT) transmissions, an electronic control system continuously analyzes key parameters
to determine the optimum gear ratio.
It then controls actuators to engage gears at just the
right time, decreasing fuel consumption and increasing driving comfort through smoother
shifting without any driver intervention. This is especially important as the automotive
world moves towards 6, 7 and soon 8-speed transmissions.
New safety functions can also be implemented, for instance the control system can
automatically reduce the drive torque to avoid skidding on slippery roads or prevent
unexpected gear shifting in curves.
To do all this, the electronic control system requires information - creating a need for
sensors.
Electricfil masters all the leading sensor technologies to bring you the right sensing solution for your every need.
Function needs
To determine the optimum gear ratio at any time and calculate the precise moment to change gears, the electronic control system needs accurate information.
- Speed of input and output shafts.
- Direction of shaft rotation.
- Position of the clutch for gear engagement control on AMT and DCT transmissions.
- Shift fork position for DCT systems.
- Oil temperature to determine the viscosity of the lubricant, used to fine-adjust the gear-shifting strategy.
- Other information such as current and target transmission ratio, gas pedal position, etc.
Sensors needs
The sensors that provide this information must offer:
- High accuracy
- Small size
- Fast response
- Easy integration
- High reliability
- Diagnostic capabilities
Depending on where they are installed, they must also withstand severe environmental conditions:
- High temperatures
- Rapid temperature fluctuations
- Electromagnetic disturbances
- Vibrations
- Corrosive liquids
Electricfil solutions
Electricfil Automotive masters all leading sensor technologies to produce optimum sensing solutions for every need. The solution path is based on more than 25 years of experience in the field.
- Analysis of customer needs to select the most suitable sensor type from our proven core technologies (LVDT, Hall, Eddy-Current, GMR, AMR, VR, etc.)
- Determination of degree of integration (single sensor, sensor cluster or mechatronic module)
- Circuit design and ASIC development if required
- Selection of electronic components and assembly technology (e.g. surface mounted devices, discrete components)
- Package design, including the selection of materials (PA, PPS, PBT, etc.), assembly process (laser, thermal or vibration welding), potting, overmolding and encapsulation techniques, sizing, etc.
- Selection of interconnections (leadframe, flex foil, cable harness, etc.)
- Magnetic circuit design (magnet materials, pole piece dimensions, etc.)
- FMEA, reliability studies, computer simulations, prototyping, initial samples, etc.
Electricfil sensing solutions for gear-shift control
Par domaine
Par application
- LVDT
- Hall position sensor
- Eddy-current position sensor
- Hall position switch
- VR speed/position sensor
- Active Hall-GMR sensor
- Oil temperature
- Multi-sensor modules
- Ignition wire set
- Integrated ignition units
- Integrated ignit.coil & wire set
- Pencil coils
- Eddy-current speed sensor
- Smart battery sensor
- Hall current sensor
- Temperature sensor
- Active speed/position sensor
- Active speed/pos./direction
- Magnetic ring system
- Magnetic ring module
- En Europe
- En Amérique
- En Asie et Océanie