Engine braking is very important in car installations, and there are differences between clutch braking, brake braking, parking brake, etc.! The use of engine braking means that the owner lifts the pedal of the car's throttle, but does not step on the clutch, and uses the compression stroke of the engine to generate effective compression resistance. The internal friction and the intake and exhaust resistance form a braking effect on the drive wheel. Since the rotation of the wheel drives the drive train, the engine under idle speed has a resistance to the reaction of the vehicle. The higher the gear position, the smaller the effect of the engine on the vehicle, and vice versa. Engine braking refers to lifting the accelerator pedal, but does not disengage the engine, and uses the internal friction of the engine and the intake and exhaust resistance to form a braking effect on the drive wheels. This is most effective when going down the slope. Suitable for slippery roads, the general truck has a lever to control (air brake) 1. Predictive braking is a complex situation that may occur in the case of a discovered situation or foreseeable. In the case of the situation, there is a plan, a purposeful relaxation of the accelerator pedal, the use of the natural resistance of the driving to slow down, and intermittently and gently according to the situation. Lightly step on the brake pedal to further reduce or stop the vehicle. This is the most common braking method for safe driving. 2. Emergency braking is when the driver suddenly releases the accelerator pedal in the event of a sudden dangerous situation. Immediately press the brake pedal hard and tighten the hand brake lever to stop the vehicle immediately. This is an emergency stop measure taken to avoid the occurrence of traffic accidents. This type of brake is more damaging to the machine parts, and the vehicle is prone to runaway and can only be used when it is unavoidable. 3, engine braking is to use the drag effect of the engine to slow down the speed, the lower the gear position, the more obvious the drag, the stronger the braking. Driving on the lower long-slope road, hanging into the low-speed gear, the drag effect of the engine can reduce the burden of the brake and reduce the number of braking, prevent the brake heat from causing the thermal attenuation of the braking force; driving on the snow, muddy road, applying the engine drag Braking prevents side slip. Parking brakes are hand brakes and are currently available in three forms: 1. For the sedan type, the hand brake lever pulls the brake cable by the principle of lever to lock the rear brake shoe or the brake caliper. 2. Light and medium-duty trucks and cars and off-road vehicles with drive shafts. The brake shank is mechanically locked to lock the brake drum on the drive shaft to achieve the purpose of fixing the rear wheel. 3. For heavy trucks and large passenger cars, the rear brake air chamber has a spring energy storage brake. When driving, the compressed air jacks up the spring. When parking, the driver only needs to operate a valve switch to release the air, and the spring will Lock the rear wheel. Engine Braking Engine braking refers to lifting the accelerator pedal, but without departing from the engine, the compression resistance generated by the compression stroke of the engine, the internal friction force and the intake and exhaust resistance form a braking effect on the drive wheels. There are three main features of engine braking: one is mainly due to the action of the differential, which can effectively and evenly distribute the braking torque on the left and right wheels, which reduces the possibility of skidding and tailing; Effectively reduce the frequency of use of the foot brake, avoiding the use of the brake for a long time, causing the temperature of the brake friction plate to rise, causing the braking force to drop or even lose its effect; third, the vehicle speed is always limited to a certain range, which is conducive to timely drop Speed ​​or stop to ensure safe driving. The brake is the brake. The brakes are divided into service brakes (foot brakes) and parking brakes (hand brakes). In the driving process, the service brake (foot brake) is generally used to facilitate deceleration and stop during the forward movement. Not only keep the car still. The parking brake is used if the service brake fails. When the car is stopped, use the parking brake (hand brake) to prevent the vehicle from slipping forward and backward. After parking, generally, in addition to using the parking brake, the upper gear should be hung in the first gear (to prevent slipping), and the downhill gear should be hung in the reverse gear (to prevent the front slip). The service brake refers to the foot brake (foot brake) throttle control brake: when deceleration is required, the 3rd gear state is maintained, the throttle is completely released, and the engine tends to idle, so it generates a resistance to the transmission system. The wheel achieves the purpose of deceleration. Let's talk about the reduction of the speed of the car. We must reduce the gears accordingly to effectively brake the engine. Here, the novice should pay special attention to the fact that it is easy to accident when shifting gears. In addition, the engine brake brake light will not light up and there is no prompt for the rear car to be more prone to accidents. Let's talk about whether engine braking is to protect the engine from fuel. Engine braking is the braking of the wheel against the engine resistance. If the engine is running, it will wear out the oil and there is no protection engine and fuel saving. Foreign imported models will also have a fuel-efficient way. However, engine braking can increase the life of the brake pads. Of course, it can't be said that the engine brake is useless. It is the best way to use this brake for slowing down on long downhill sections. But these must be based on your skillful application of engine braking.
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