"driving engine" is correct and usable in written English.
You can use it to refer to a type of engine used in a vehicle. For example: "The car has a powerful driving engine that makes it able to move quickly."
The President was the driving engine behind his actions.
The accumulation of capital had come to be recognized as the driving engine of the system.
enlargement is no longer the driving engine of European foreign policy," Mr. Demes said.
"My whole life I'd been taught that something was good because it was original that singularity was the driving engine of value".
The driving engine of time banking is a kind of pay-it-forward reciprocity that sustains a shared sense of community commitment and community capacity.
But it wasn't long before she dropped out, moved to New York City and threw herself into the Student Nonviolent Coordinating Committee, then a driving engine of the civil rights movement.
Nor does the government do anything to encourage banks to renew their past role as driving engines for growth.
Health care spending is one of the driving engines of the economy of New York, which has some of the nation's premier teaching hospitals.
Many firefighters, he said, are capable of driving engines, even though they have not gone through the department's chauffeur training course.
The contrast between the speech and manners of the street urchins and the well-educated characters is one of the driving engines of the show".
In Austria, Mozart has long been one of the driving engines of the economy; his portrait is even on a euro coin.
