What does driving resistance mean?
3 Answers
Driving resistance refers to the resistance encountered by a vehicle during movement. The driving resistance of a vehicle consists of four components: rolling resistance, acceleration resistance, gradient resistance, and air resistance. Below is more detailed information about these resistances: 1. Pressure resistance: This is the component of the resultant force of normal forces acting on the outer surface of the vehicle in the direction of travel, accounting for approximately 55% to 65% of air resistance. When a vehicle moves forward through the air medium, the air at the front of the vehicle is compressed, increasing the pressure acting on the front, while a vortex zone forms at the rear, creating negative pressure and reducing the pressure acting on the rear. 2. Induced resistance: This effect causes the air flow speed to be faster at the top and slower at the bottom of the vehicle during high-speed driving, resulting in different air pressures between the upper and lower parts. The greater pressure at the bottom creates a horizontal component force difference, known as induced resistance, which accounts for about 6%-8% of air resistance. This force essentially acts as a lifting force on the vehicle, which is the main reason some cars feel 'floaty' at high speeds. 3. Interference resistance: This is the air resistance caused by protruding elements on the vehicle's surface during movement, such as door handles, rearview mirrors, suspension guide rods, axles, fenders, etc., accounting for about 12%-18% of the total air resistance of the vehicle.
Driving resistance refers to the various resistances a car encounters while moving, which make it harder for the vehicle to move forward, requiring the engine to exert more effort to overcome them. I deeply experienced this during long-distance highway driving—when speed increases, the wind resistance becomes significant, as if the air is pushing against the car's body, holding it back. The friction between the tires and the road is called rolling resistance, which becomes more noticeable when tire pressure is low or the tires are worn. On slopes, there's gradient resistance—climbing a hill feels like moving with extra weight. During acceleration, there's also the acceleration resistance caused by inertia. All these resistances combined consume more fuel, increasing fuel consumption. Maintaining a steady speed, ensuring the car has good aerodynamics, and regularly checking tire conditions can help reduce resistance and save money. Adopting good driving habits ensures both safety and fuel efficiency.
Driving resistance refers to the opposing forces encountered by a vehicle in motion, simply understood as the car counteracting external influences. It can be categorized into several major types: air resistance comes from airflow impacting the vehicle body, especially noticeable at high speeds when wind resistance becomes significant; rolling resistance is caused by tire deformation and ground friction, which increases with improper tire pressure; gradient resistance is the effect of gravity when climbing or descending slopes; acceleration resistance manifests during starting or speed changes. Through my research, I've found that these resistances increase fuel consumption because the engine must burn more fuel to overcome them. Reducing resistance can be achieved by improving aerodynamic designs, such as adding a spoiler, or choosing tires with low rolling resistance. Proper driving techniques, like maintaining a steady speed, can also significantly enhance fuel efficiency, which has a notable impact on performance.
