Will the Vehicle Maintain a Constant Speed Without Pressing the Accelerator?
1 Answers
If the accelerator is not pressed, the vehicle will not maintain a constant speed. If the accelerator pedal is released during driving, the speed of the motor vehicle will decrease. The movement of the vehicle is directly controlled by the accelerator pedal, and maintaining a constant speed can result in relatively lower fuel consumption. Throttle, also known as the accelerator, refers to the control device that regulates the engine's power (thrust). In piston aircraft engines, the throttle controls the carburetor's throttle opening to adjust the cylinder's weight, thereby determining the engine's output power. In gas turbine engines, the throttle controls the fuel flow measured by the fuel regulator, thus determining the thrust generated by the engine. To maintain a constant speed in a motor vehicle: The vehicle's cruise control system needs to be activated to keep the vehicle moving at a constant speed. Once the cruise control system is engaged, the vehicle will maintain a constant speed without the need to press the accelerator pedal. This is particularly suitable for long-distance driving and travel, effectively reducing driver fatigue. Principle of the Cruise Control System: The system mainly consists of a control switch, a control unit (cruise computer), and a servo (actuator). Simply put, the cruise control system works by the cruise control unit comparing the pulse signals from the speed sensor with the set speed and then adjusting the throttle opening to increase or decrease, ensuring the vehicle maintains the set speed. For example, when the vehicle is going uphill and the speed drops, the pulse signals from the speed sensor decrease, and the control unit will send a command to the servo actuator to open the throttle at an appropriate angle to maintain the speed. Conversely, when going downhill, the throttle opening will be reduced. Additionally, the driver can manually accelerate, decelerate, or resume a memorized speed by operating the control switch. The cruise control system can be deactivated by pressing the brake pedal or clutch pedal or by turning off the control switch. Advantages of Constant Speed Driving: The benefit of maintaining a constant speed in a motor vehicle is that it provides excellent fuel economy, but it also requires finding an appropriate speed range. The optimal constant speed interval for a motor vehicle is between 80 km/h and 110 km/h, primarily determined by the engine's characteristics.
