
There's already been a silent technology explosion in automobiles over the last ten years. Command and control has become largely a computerized affair. With high and low speed data buses throughout the automobile, your car is basically a network. It used to be that you'd press the power window switch and current would flow to a motor, or it would trigger a relay. It was simple to execute in the design and manufacturing stages, and troubleshooting was a matter of time spent with a test light and a meter. Modern cars use protocols like
CAN, or Controller Area Network, to facilitate the liberal smattering of increased functionality we all desire in our vehicles. Press that same window switch now, and a message is sent to the central processor that you desire a change in the window status. The central processor then alerts the window motor to energize in the proper direction, and then it's off to the races for the glass. Sounds overly complex at first blush, doesn't it?
The old way had some drawbacks that the new systems hopefully alleviate. Firstly, there were lots of potential failure points with analog control systems. Also, components had to be wired to each other for functionality, and that required lots of wire. Wire is expensive (checked the price of copper lately?), and it adds weight and takes up space. Networking protocols allow automakers to integrate functions as never before – check out the way the
MazdaSpeed 3 dials down its power output depending on steering angle – while using less wire and having a system that's more reliable. These changes have gone on virtually unknown to most motorists, but the cool stuff is just around the bend.
[Source: Automotive Design Line]