Ohjausapu

Ohjausapu, often translated as steering assistance or power steering, refers to a system that reduces the effort required from the driver to turn the steering wheel of a vehicle. This makes maneuvering the vehicle, especially at low speeds or when parking, significantly easier and more comfortable. Without ohjausapu, a vehicle's steering system would rely solely on the driver's physical strength, which would be considerable in many modern cars with wide tires and heavy components.

Historically, ohjausapu systems were mechanical, often employing hydraulic pumps driven by the engine to generate the necessary pressure. These hydraulic systems remain common but are increasingly being supplemented or replaced by electric power steering (EPS) systems. EPS uses an electric motor to provide the assistance, offering advantages such as greater energy efficiency, as the motor only draws power when steering input is detected, and easier integration with other vehicle electronic systems.

The implementation of ohjausapu has greatly improved vehicle usability and safety by reducing driver fatigue and allowing for more precise control. Modern ohjausapu systems can also incorporate variable assistance, meaning the amount of help provided can change based on factors like vehicle speed, providing lighter steering for parking and firmer, more responsive steering at higher speeds for better road feel.