What Causes the Brake Pedal to Be Hard to Press in New Energy Vehicles?

What Causes High Idle Speed in Cold Engine During Summer?

Reasons for high idle speed in cold engine during summer: A cold engine refers to a state where the engine has cooled down. When the engine is cold, due to low temperature in the cylinders and poor gasoline atomization, the electronic fuel injection system increases the concentration of the air-fuel mixture to meet combustion requirements. Consequently, the engine raises the idle speed to increase fuel injection, thereby enhancing the mixture concentration. As the cylinder temperature rises, the need for an overly rich air-fuel mixture diminishes, leading to a gradual reduction in idle speed and fuel injection. Once the engine reaches normal operating temperature, the ECU maintains an optimal air-fuel ratio of 14.7, which is the ideal proportion for complete combustion of air and fuel. If the idle speed is around 1500 RPM in a cold state and decreases as the engine coolant temperature rises, eventually stabilizing between 600 to 800 RPM (idle speed varies by vehicle), it is considered normal.

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What National Emission Standard Should a Car Produced in 2014 Comply With?

Cars produced in 2014 could comply with either National IV or National V emission standards. You can check the environmental label located at the upper right corner of the vehicle's windshield, which indicates the specific emission standard the car meets. The primary pollutants emitted by automobiles include carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and particulate matter (PM). These pollutants originate from the exhaust pipe, crankcase, and fuel system. The National IV emission standard represents the fourth phase of China's motor vehicle pollutant emission regulations, targeting key pollutants such as HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). This standard achieves reduced emission levels through advanced technologies like improved catalytic converter active layers, secondary air injection systems, and cooled exhaust gas recirculation systems, effectively controlling and minimizing vehicle emissions below specified thresholds.

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Is car maintenance based on mileage or time?

Car maintenance is determined by whichever comes first between mileage and time. For vehicles driven frequently, maintenance is based on mileage, while for those driven less often, it's based on time. Car maintenance refers to the preventive work of regularly inspecting, cleaning, replenishing, lubricating, adjusting, or replacing certain parts of the vehicle, also known as vehicle servicing. Modern car maintenance primarily includes servicing the engine system, transmission system, air conditioning system, cooling system, fuel system, and power steering system. The purpose of car maintenance is to keep the vehicle clean, ensure normal technical conditions, eliminate potential hazards, prevent failures, slow down the deterioration process, and extend the service life.

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How Many Days Does It Generally Take to Transport a Car by Car Carrier?

Transporting a car by car carrier generally takes 2-3 days for nearby areas, while the farthest destinations may take up to around 15 days. Here is some information about car carriers: 1. Car Carrier: A professional vehicle for car transportation, also known as a "cage truck" in some provinces. 2. Classification: Generally divided into large car carriers and small car carriers. The following factors determine the transportation time of car carriers: 1. Transportation City: Many cities prohibit car carriers from entering highways during the day, so car carriers are parked during the day and only start transporting at night. For such cities, the daily distance covered is only about 600-700 kilometers. 2. Drivers: Drivers are not machines, and prolonged driving can cause fatigue. Therefore, if a car carrier has only one driver, sufficient time must be allocated to ensure rest.

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What is the speed range of the 5th gear?

5th gear speed range is 60-100km/h. Here is a detailed introduction about car gears: 1. Speed aspect: The speed range for 1st gear is 0-5km/h. For 2nd gear it's 5-20km/h, 3rd gear 20-40km/h, 4th gear 40-60km/h, and 5th gear 60-100km/h. Vehicle speed refers to the distance a car travels per unit time, simply called speed. It can be classified as spot speed, section speed, and design speed. 2. Gear shifting timing: Generally, the optimal shifting point for most cars is when the engine reaches 2000r/min, not exceeding 2500r/min. For some high-displacement, high-power engines, shifting can be done around 3000r/min.

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Where are Michelin tires produced?

Michelin tires originate from France, with production facilities in Shanghai and Shenyang, China. The Michelin Group operates 70 factories and 6 rubber plantations across five continents, with research and testing centers located in France, Japan, Spain, the United States, Thailand, and China. It has established marketing and sales organizations in over 170 countries and regions. Below is an introduction to Michelin tires: 1. Brand Introduction: Michelin tires are a tire brand under the Michelin company, developed by the Michelin brothers, and are one of the world's top three tire manufacturers. 2. Four Major Series: (1) The Primacy series focuses on quiet and comfortable tires. (2) The LC Bo Yue series is positioned for quiet comfort and fuel efficiency. (3) The HP series is positioned for quiet comfort and strong handling performance. (4) The 3ST Hao Yue series is the successor to the LC Bo Yue, gradually replacing the Primacy and LC Bo Yue series in the market.

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What Causes the Brake Pedal to Be Hard to Press in New Energy Vehicles?

What Causes High Idle Speed in Cold Engine During Summer?

What National Emission Standard Should a Car Produced in 2014 Comply With?

Is car maintenance based on mileage or time?

How Many Days Does It Generally Take to Transport a Car by Car Carrier?

What is the speed range of the 5th gear?

Where are Michelin tires produced?

What are the common faults of car electric pedals?

What are the new regulations for annual inspection of five-seat private cars?

What is Bugatti?

Should You Drive an Automatic Transmission Car with One Foot or Two Feet?