Now that the temperature has plummeted, â€œhot carsâ€ have become the focus of everyoneâ€™s discussion. In many peopleâ€™s minds, when they use the car in the early morning, they always wait for a few minutes after starting the vehicle to wait for a few minutes. Vehicles are the most beneficial. In fact, engine parts wear out and more than 90 percent of them are caused within three minutes after the vehicle is started. Let's discuss the necessity of hot cars and hot cars.
How to properly start and hot car vehicle maintenance before the Spring Festival
The composition of the engine lubrication system
First of all, we first understand the engine's lubrication system. The engine's lubrication system is mainly composed of oil pump, oil filter, oil radiator, and oil cooler. Among them, in the cold start, we are referring to the oil pump. After we energize the vehicle, the oil pump will begin to operate and deliver oil from the sump to various friction surfaces.
Engine lubrication diagram
When the engine is working, many transmission parts are used for high-speed relative motion under very small clearances, such as crankshaft journal and main bearing, crank pin and connecting rod bearing, cam journal and cam bearing, piston, piston ring and cylinder wall surface. , The air distribution mechanism of each pair of sports and transmission gear and so on. Although the working surfaces of these parts are all finely processed, the surfaces are uneven when viewed in an enlarged scale.
Engine lubrication system functions
The role of the engine lubrication system is mainly: lubrication, cleaning, cooling, sealing, anti-corrosion, hydraulic and shock absorption buffer.
Today's topic mainly embodies the role of lubrication and cushioning. Forms an oil film on the surface of moving parts, lubricates the surfaces of moving parts to reduce drag and wear, reduces the power consumption of the engine, and absorbs shock to reduce vibration.
Lubrication system lubrication
Lubrication system lubrication methods are mainly pressure lubrication, splash lubrication and regular lubrication. When we heat the car in winter, it is necessary to make the engine fully lubricated. After the oil pump sends the oil to various friction surfaces, we must rely on splash lubrication to make the engine fully lubricated.
Splash lubrication is the use of oil droplets or oil mist splashed from the moving parts of the engine to lubricate the lubrication of the friction surface, it can be exposed on the outside to withstand the light load of the cylinder wall, the relative sliding speed of the piston pin and The cam surface and tappet of the valve train are lubricated.
Why hot car
After the vehicle has been parked for a long time, the oil in the engine will flow back to the bottom of the oil sump at the lower part of the engine. Therefore, the engine's upper part is in an oil-free state and lacks lubrication when it is not used for a long time or after winter. In about 30 seconds after launch, the oil will be transported to the parts of the pistons, connecting rods, and crankshafts where the engine needs lubrication most, through the operation of the oil pump and splash lubrication, but even if the engine is started, it will be on the road. As long as you do not slam the throttle pedal and keep it running at a low speed, the effect is the same as that of idling.
Engine working environment
Before the engine reaches the operating temperature, it is approximately between 90-110 degrees. Its oil supply system cannot effectively gasify the gasoline completely because of its low temperature. When the gasoline is not vaporized and is in a liquid state, it is not flammable. , which will form carbon deposits.
Engine carbon deposit
Lubrication of transmission gears is the most difficult to understand and most easily overlooked. Transmission gear oil is the same as engine oil in that gear oil is returned to the lower half of the gearbox when it is cold. Only when the vehicle is moving, the gear oil at the bottom can be transported to the upper part of the gearbox due to the operation of the gears, so that it can be lubricated.
This is why the reason for getting the car moving is that there is no gear oil pump in the transmission, and only the engine is moving in the local hot car, and the rest is in a static state. Only after the vehicle has been active for some time can this situation be improved.
Buick care car steward warm reminder: Some drivers in order to save fuel, in high-speed or downhill, shift lever to N block glide, which is likely to burn out the transmission. When the long slope is actually required to slide, the shift lever can be kept in the D block, but the engine can not be turned off.
The correct method of hot car
In-situ idling hot cars are affected by temperature and idling idling, which results in insufficient combustion of gasoline, easy formation of carbon deposits, and insufficient fuel oil, which easily leads to serious exhaust emission overdue, which virtually aggravates the load on the three-way catalytic converter.
The correct hot car method is to slow down the road after starting the vehicle for 30 seconds to 1 minute. At this time, it is not possible to accelerate rapidly. It should be kept at a low speed and the engine speed should be controlled at about 1000 rpm until the engine temperature rises to normal operating temperature. Afterwards, follow your daily routine.
EFI fuel supply system
Almost all vehicles on the market today belong to EFI. Since the EFI car is different from the old cars of the past, the fuel supply system of the EFI car is completely controlled by the ECU module of the engine. Its control system is independent of the air flow rate and temperature. influences. Therefore, as long as the oil pressure rises, the water temperature will reach 50 degrees.
Tachometer of diesel car
If it is a diesel car, some vehicles need to add some throttle to start a fire. There are also diesel vehicles that need to press the heat button 30 for 50 seconds before starting the vehicle, which is a good ignition. The refueling door is only aimed at the older diesel vehicles. Generally, the gasoline vehicles do not add fuel, otherwise it will increase fuel consumption and damage the engine.
Pre-trip safety inspection
When driving, we have to maintain good driving habits. Before starting, we must first check the appearance of the vehicle, whether there are scratches on the chassis, tires, and whether the tires are lack of air.
At the same time, check whether the liquid level of the coolant or brake fluid is between the maximum and minimum scales.
Into the car to test the engine, when the cold start the engine, it should start smoothly, each time does not exceed 5 seconds, the ignition can be launched once or twice, after the start of the engine speed should be stable, no shaking, no abnormal noise.
Changing the engine speed excessively should be sleek and the corresponding pointer of the instrument panel responds sensitively. Acceleration. The engine should be free from sudden explosions and fire, tempering, and cracking. When stable at a certain speed, the engine should have no abnormal noise, and the corresponding indicator of the instrument panel should be stable without any significant fluctuation.
The engine should run smoothly
When the vehicle is running at low, medium and high speeds for a period of time, the engine is stabilized at idle for a certain period of time to see if the engine is stable, if there is jitter and noise, and at the same time observe the exhaust gas discharged from the rear exhaust pipe of the vehicle. Smokeless and tasteless.
Listening to the state of the engine while driving
Driving in the winter is a test for the vehicle itself. Correctly heating the vehicle before driving and letting the vehicle have a good driving condition are the prerequisites for good driving habits, and can also ensure our driving safety to a large extent.
Buick care car stewards warm reminder: For some novice and female drivers, "hot car" is still a relatively vague concept. Although the EFI car does not affect driving without a hot car, the life span of the engine will be seriously affected over time. Therefore, in the winter to develop a "hot car" habits, virtually for us to reduce the cost of some car maintenance.
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