Jack Ewing:

The mere knowledge that Apple has a team of several hundred people working on car designs changed the conversation this week at the Frankfurt International Motor Show. Along with Google, Apple has focused the minds of auto executives on the challenge posed by new technologies that have the potential to disrupt traditional auto industry hierarchies.

This year, “connectivity” has supplanted “horsepower” or “torque” as the prevailing buzzword in Frankfurt. The talk is of self-driving cars, battery-powered cars, and information technology designed to link cars with data networks to make driving safer and more efficient.

Even though neither Apple nor Google is close to mass-producing a vehicle, nervousness about their intentions — which remain cloaked in mystery — is understandable.

As cars increasingly become rolling software platforms, Apple and Google have depths of tech expertise that the carmakers would have trouble duplicating. And those Silicon Valley companies have financial resources that dwarf those of even behemoth companies like Daimler and Volkswagen. Google, which began working on self-driving cars in 2009, is valued by the stock market at more than five times the worth of either of those carmakers. Apple is worth eight times as much. That gives them an advantage in a business that requires huge investment in research and development.

“What is important for us is that the brain of the car, the operating system, is not iOS or Android or someone else but it’s our brain,” Dieter Zetsche, the chief executive of Daimler, the maker of Mercedes vehicles, told reporters at the car show. IOS is Apple’s operating system for mobile devices.

“We do not plan to become the Foxconn of Apple,” Mr. Zetsche said, referring to the Chinese company that manufactures iPhones.