What does engine braking mean? This problem may be that many car owners do not know what it means, but know when to use the engine brake. But can't understand the meaning of engine braking correctly, and can it make proper use of engine braking? Today we will explain to you what it means to brake the engine and teach you how to use the engine brake properly.
What is the engine brake?We generally say that the engine brake is also "trailer" -- the gear is not oiled, and the engine has no traction. On the contrary, because the wheel rotation drives the power train, the engine under idle speed has a resistance to the car. The higher the gear position, the smaller the effect of the engine on the car, and vice versa. "Engine Brake" is a term for driving behavior. It refers to the use of the resistance generated by the engine to effectively control the speed of the vehicle. Both the "downshift" and "loose throttle" measures can be used to control the speed with engine resistance. the goal of. Let's take a look at the following
Generally used mainly on highways or national highways, that is, when the driving speed is high, if it is found that the traffic flow in front is large, it is necessary to decelerate or avoid it in advance. This method can be adopted (the premise is to bring the gear to slide). The advantage of the loose throttle method is that it can avoid frequent shifting, reduce driver fatigue, save fuel and improve the economy of the vehicle.
Downshift method:Refers to the driving mode of controlling the speed of the vehicle when the vehicle is switched to a lower gear position on the next steep slope or continuous downhill slope. It is a driving method often used by experienced drivers. Because the long-term use of the brakes during the downhill will cause the brake disc brake disc temperature to rise sharply, the higher the temperature, the worse the braking effect, and even the danger of brake failure. Using this method, the river can better control the speed of the vehicle, reduce the braking time of the brake pads, and prolong the service life of the brake system. Of course, the most important thing is to improve driving safety and avoid safety accidents.
How the engine brake worksBecause of the existence of the gearbox, that is, the different gear ratios of the gears are the same, the higher the gear position, the smaller the gear shift. During normal driving, the engine rotates 100 times in the first, second and third gears, and the wheels turn 5 times, 10 rings and 20 rings respectively, and the wheel circumference is constant, so the higher the gear position, the more the distance is completed per unit time. Long, that is, the faster the speed;
When “trailer†(engine idling), the engine speed is constant at this time, when the first, second and third gears are respectively hung, the required wheel speed is higher and higher, when the actual speed of the wheel exceeds the corresponding gear. The higher the maximum allowable speed of the bit, that is, the larger the speed difference, the larger the "engine braking", and the greater the drag.
From the perspective of braking, it is naturally less and less obvious.
First, due to the action of the differential, the braking torque can be evenly distributed on the left and right wheels, reducing the possibility of side slip and tail.
The second is to effectively reduce the frequency of use of the foot brakes, to avoid the use of the brakes for a long time, resulting in an increase in the temperature of the brake linings, causing the brakes to drop or even lose their effect;
Third, the speed of the vehicle is always limited to a certain range, which is conducive to timely speed reduction or parking to ensure safe driving.
How to make proper use of engine braking(1) When slippery roads such as residual oil roads, muddy snow and ice roads, use engine braking as much as possible, and flexibly use the parking brake to minimize foot brake. If you use a foot brake, it is best to use intermittent braking, and you can not step on it to prevent side slip.
(2) In the case of steep roads such as the lower slope and the rugged mountain road, it is necessary to use the engine brake and the intermittent brake to control the vehicle speed. Since using the brake for a long time will affect the braking performance and even lose the braking effect. Therefore, in this case, you should park and rest properly, and continue to drive after the brake hub and brake shoes are cooled.
(3) When using engine braking, it is necessary to select an appropriate gear according to road conditions and vehicle load, and to brake the appropriate wheel according to the speed of the vehicle. The gear is too low and the speed is too slow; the gear is too high and the wheel brakes act too frequently.
(4) Drive the car under the long slope or the snow and ice road brakes, and hang the low speed gear step by step, the speed will drop a little. For example, the next long slope, you can hang a suitable low gear, do not step on the brakes, you can try to step on the clutch, the car will accelerate the slide; Panasonic clutch, it feels like stepping on the brakes. The benefits of engine braking are safe and fuel efficient, primarily for safety.
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