发动机制动

发动机制动 brief introduction The use of engine brake is to lift the accelerator pedal, but do not take off from the engine, using the compression of the engine compression stroke generated by the resistance, internal friction and intake and exhaust resistance to the driving wheel brake effect. The engine brake has three characteristics: one is due to the differential effect, can be evenly distributed around the braking torque on the wheel, reducing the possibility of sideslip and spin; two is effective in reducing the frequency of using the foot brake, avoid long time use of brakes, brake friction causes the temperature to rise, making the power down, or even lose their role; three is the speed of the car is always limited in a certain range, is conducive to slow down or stop, to ensure traffic safety. Edit the paragraph instruction Well, in actual operation, how can we make rational use of the engine brake? 1, in the muddy road, snow road residue slippery road, should try to use the engine brake, flexible use of the parking brake, minimize foot brake. If you use the foot brake, it is best to use intermittent braking, and not to step on foot, in case of sideslip. 2, in the long downhill, such as steep rugged mountain road, must use the engine brake, with intermittent brake to control the speed. The use of brakes for a long time can affect the braking efficiency and even lose the braking effect. Therefore, in this case, the rest should be stopped properly until the brake hub and brake shoes are cooled and continue to travel. 3, the use of engine braking, according to the road conditions and vehicle load and so on, choose the appropriate gear, and according to the speed of the car to give appropriate wheel brake. The gear is too low, the speed is too slow, the gear is too high, the wheel brake action is too frequent. 4, if there is no special device on the engine, when using the engine brake, should not flameout. Otherwise, by inhalation of combustible mixture in cylinder gasoline may condense on the wall of the cylinder oil dilution, influence the lubrication performance, accelerated engine wear; in addition, a part of the petrol may also be condensed in the exhaust pipe and the muffler, the re ignition will cause a "blowout" phenomenon. The engine brake is the stall gear, the hanging gear does not give oil, the engine does not have the traction to the vehicle. On the contrary, because the wheel rotates to drive the transmission system, the engine under idle speed has a reaction resistance to the car. The higher the gear, the smaller the engine's impact on the vehicle, the greater the reverse. First talk about the speed down, we have to reduce the corresponding gear in order to effectively brake the engine, where newcomers pay special attention to, that is, when shifting gears prone to accidents. Again, the engine brake light will not light, the rear car does not prompt, more prone to accidents. To say that the engine brake is not to protect the engine fuel, the engine brake wheel braking resistance of engine is overcome, as long as the engine running costs of oil will wear what does not exist to protect the engine and fuel. Imported cars will also have fuel-efficient ways. However, the engine brake can increase the life of the brake pads. Of course, there is no point in saying that the brakes on the engine are useless, and that this is the best way to slow down in long downhill sections. But it all depends on how well you can apply the engine brake. Edit this paragraph, the engine brake has three salient features: One is due to the differential effect, can be evenly distributed around the braking torque on the wheel, reducing the possibility of sideslip and spin; two is effective in reducing the frequency of using the foot brake, avoid long time use of brakes, resulting in brake friction plate temperature, the braking force is decreased, even lost three speed; always be limited within a certain range, is conducive to slow down or stop, to ensure traffic safety. Engine brake have three kinds of methods: 1, predictive braking is found or predicted in complex situations that may occur in the case of advance planning, to relax the accelerator pedal, the use of natural resistance when driving sliding speed, slow and intermittent, and according to the situation in light of the brake pedal, the speed to further reduce or stop. This is the most common method of braking for safe driving. 2, emergency braking is a sudden occurrence of dangerous situations, the driver quickly release the accelerator pedal, immediately forced to step on the brake pedal, while tightening the handbrake lever, so that the vehicle stopped immediately. This is to avoid the occurrence of traffic accidents and emergency parking measures, this brake damage to the larger parts, and vehicles prone to out of control, can only be used in the case of an emergency. 3, the engine brake is to use the engine drag to slow down the speed, the lower gear, traction more obvious, braking stronger. Driving on downhill roads, hang into the low gear to use the engine pulling resistance can reduce the burden and reduce the number of brake brake brake brake force, to prevent overheating caused by thermal decay; driving in the snow, muddy road, engine braking traction resistance can prevent sideslip. How can we make rational use of the engine brake? 1, in the muddy road, snow road residue slippery road, should try to use the engine brake, flexible use of the parking brake, minimize foot brake. If you use the foot brake, it is best to use intermittent braking, and not to step on foot, in case of sideslip. 2, in the long downhill, such as steep rugged mountain road, must use the engine brake, with intermittent brake to control the speed. The use of brakes for a long time can affect the braking efficiency and even lose the braking effect. Therefore, in this case, the rest should be stopped properly until the brake hub and brake shoes are cooled and continue to travel. 3, in the good road on the predictability of deceleration brake, can use the engine brake. But when the emergency brake should not use the engine braking, the braking torque of wheel brake, there must be a part of the moment of inertia to overcome a sharp slowdown in the engine, it will delay the wheel lock time, reduce the braking efficiency. 4, the use of engine braking, according to the road conditions and vehicle load and so on, choose the appropriate gear, and according to the speed of the car to give appropriate wheel brake. The gear is too low, the speed is too slow, the gear is too high, the wheel brake action is too frequent. 5, if there is no special device on the engine, when using the engine brake, should not flameout. Otherwise, the gasoline in the combustible mixture of the suction cylinder may condense on the cylinder wall, dilute the oil, influence the lubrication performance and accelerate the engine wear, A part of the gasoline may condense in the exhaust pipe and muffler and cause a "blowout" when it is re ignited. Research and Prospect of engine brake technology in this edition The modern automobile power is more and more big, the speed is more and more high, the vehicle internal friction loss is more and more small, which means that reduce the deceleration capacity of the vehicle itself; at the same time, due to the increase of the total vehicle quality, rely solely on the main brake system of the automobile itself has been unable to meet the requirements of braking vehicle high speed and heavy load condition. In order to ensure its safety performance, it is necessary to add auxiliary brake. In many countries of the world (such as Germany, France and Switzerland), the auxiliary brake system has been taken as the necessary system of commercial vehicles. At present, the auxiliary brake device used in automobiles is retarder. The common retarders include electric eddy current retarder, permanent magnetic retarder, hydraulic retarder and exhaust retarder. From the installation position and action mode, mostly through the braking torque applied to the opposite direction of the intermediate transmission system to achieve the braking effect, and the larger braking power retarder (such as eddy current retarder and hydraulic retarder etc.) large volume, and increase the quality of transmission system. When the retarder works for a long time, the braking effect is greatly reduced, even down to about 30% of the working capacity of the cold state due to the influence of temperature rise. Engine retarder is through the automobile drag down the engine, braking efficiency generated by engine mechanical loss, pumping loss and compression power, and change the engine working process of drag down, thereby increasing the power of automobile brake. Engine retarder is only a hydraulic product at first, but with the application of electric technology in the engine, the electric control technology of engine retarder is gradually mature, and the braking performance is gradually improved. When the engine retarder is used, the braking power of the non supercharged engine can reach 75% of the rated power of the engine, and the braking power of the supercharged engine can reach 90% of the rated power of the engine. Compared with other engine retarder retarder, small volume, light weight, compact structure, short response time, low cost, large braking power and braking power can be adjusted, a stable when used for a long time, not because of the temperature influence factors of braking performance etc..