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The Bosch SMI540 is a micro-mechanical inertial measurement unit for vehicle dynamics control in low-cost SOIC16W housing.

The unit opens up development possibilities for the ESP electronic stability programme.

The 3D sensor simultaneously monitors three of a vehicle’s movement axes – two acceleration or inclination axes (ax, ay), and one axis of rotation.

Previously, at least two separate sensors were required for this.

The SMI540 has a digital serial peripheral interface (SPI) with two standard protocols.

Thanks to a constant internal self-test of the yaw-rate sensor element, this interface meets the highest operating safety standards, said Bosch.

Samples of the sensor are already available at Bosch Automotive Electronics.

The sensor is set to go into large-scale series production from the second quarter of 2010.

Bosch also plans to launch the SMG540, a version of the sensor that contains only the yaw sensor element.

Two of the SMI540’s three sensor signals provide information that is relevant for the ESP system: the yaw rate and lateral acceleration.

The remaining third sensor signal is not generally used by ESP.

It measures a vehicle’s acceleration or inclination in the direction of travel.

Developers can use the information this sensor delivers for other applications, such as the hill hold function or for fuel-saving functions in cars with automatic transmissions (N control).

The car automatically shifts into the fuel-saving ‘N’ gear, provided that – and this is where the inclination sensor comes into play – the car is on level ground and cannot begin to move by itself.

The SMI540 serves conventional ESP concepts as with a separate sensor device in the vehicle interior as well as new, more cost-effective approaches.

As one example, the Bosch ABplus airbag concept no longer contains the sensor device for ESP control.

In this case, the inertial sensor is now integrated directly into the airbag control unit.

These are ideal conditions for the SMI540, with its small SOIC16W housing (10.3mm x 10.3mm x 2.65mm) and multi-axial sensors, to show its strengths.

The sensor is also suited to the alternative concept of a central domain control unit (DCU).

This unit integrates several of a vehicle’s sensor functions and forwards measurements for safety and comfort and well as driver information to the relevant on-board electronics.

Bosch Rexroth

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, and Factory Automation to develop innovative components as well as tailored system solutions and services.

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, and Factory Automation to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, more than 33,700 associates generated sales revenue of approximately 5.6 billion euros in 2014.

The Bosch Group is a leading global supplier of technology and services. It employs roughly 360,000 associates worldwide. The company generated sales of 49 billion euros in 2014. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiary and regional companies in some 60 countries. Including its sales and service partners, Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. In 2014, Bosch applied for some 4,600 patents worldwide. The Bosch Group’s strategic objective is to create solutions for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.”

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