Functional description

• Controls all functions of an automatical transmission.
• The possible body configuration shapes are aimed on an application in the engine or on transmission (high temperatures and vibration load)

Specification:

• 32 bit µController, optimized ASIC’s
• Suitable for all transmission types
• Degree of protection: IP 40 – IP 69
• New modular SW architecture

• Robust design with improved EMC and extended temperature ranges (40°C/+125°)
• Scalability in core performance, flash size, output power stages
• Improved accuracy of solenoid current control (ASIC based)
• Variable SW-sharing models

Functional description:

• The Direct Electronic Shift Control is mounted in the hydraulic control plate of the transmission.
• It is supplied at main pressure level and regulates the pressure in the clutch.
• The materials are adapted to the application in the gear oil (aggressiveness opposite metals and synthetic materials, corrosion.)

Specification:

• Supply Pressure: up to 4000 kPa
• Current range: 0…1200 mA
• Flow up to 8.0 l/min
• Leckage 0.1 l/min @ 530 mA
• Diameter: 28 mm

• Very low leakage possible
• High accuracy
• Variability of the connectors
• High volume production w/ excellent quality

Functional description:

• The Variable Transmission Solenoid is mounted in the hydraulic control plate of the automated transmission.
• It is a Bleed type pilot control valve which is available with different characteristic lines (normally low or normally high).

Specification:

• Supply Pressure up to 900 kPa
• Current range 0 …1200 mA
• Control pressure 0 …94 % of Psup
• Flow up to 1.4 l/min
• Leakage 0.1 l/min @ CE pos.
• Diameter 23 mm

• Low cost but high accuracy
• High contamination robustness
• Variability of the connectors
• High volume production w/ excellent quality

Bosch also delivers the hydraulic modules complete with integrated actuators, eletrical plug-in connectors and terminals, and transmission connector. In addition, sensors (for instance for pressure or temperature) can be integrated in the module. Mounting the fully tested module on the transmission control plate is a simple matter and has advantages for the transmission manufacturer with respect to costs, handling,and logistics.

The electronic module combines the electronic components for the transmission control, microhybrid ECU and sensors. It also features connections for further external sensors and for solenoid valves.

The fact that the individual components are integrated, together with the application of microhybrid technologies, means that the complete control module can be manufactured at a competitive price. The omission of plug-in connections and wiring lead to further advantages for the vehicle and transmission manufacturers with regard to costs and weight. Furthermore, the reduction in the number of components and interfaces improves the system's reliability, and thus results in further increases in the quality of the overall system.

The electrohydraulic module is so robust and resistant to external influences that it can be installed directly in the transmission.

Continuously variable transmissions feature maximum gear-shift sophistication and contribute to reduced fuel consumption. The fact that electronic control permits continuous variation of the transmission ratio means that customized gear-shift strategies become possible. These can be aligned to fuel-economy or sporting requirements. The very high transmission ratios permit operation at an economical operating point.