At the beginning of 2010, at the beginning of the year, snowstorms occurred in places like Tianjin and Beijing. The minimum temperature suddenly dropped to -20°C. Many buses stopped due to the engine's inability to start, which caused great inconvenience to people travelling in inclement weather. However, passengers on the 651 line from Tanggu to Tianjin City were pleasantly surprised to find that they did not have any problems with this line and they were still operating normally on time. The reporter learned from the bus company that these 25 buses include the Xiamen Golden Dragon, Suzhou Golden Dragon, Zhengzhou Yutong and other brands, and are equipped with Dongfeng Cummins ISDe series diesel electronically controlled engines.
According to the captain of the bus company's fleet, Li said, the 25 buses were purchased by the Tianjin Binhai Bus Company in September 2007. They mainly ran Don Juan to the 651 line in Tianjin, and have been in operation for more than two years. The engine has not yet appeared. One failure. “You also know that the weather conditions in the north are quite special. In the spring, the sand and sand are big, the winter temperature is low, and the requirements for the engine are particularly high. We chose the Dongfeng Cummins Engine because it is a big brand and has a good reputation; the second is to consider To its reliability, it is more sturdy and rarely fails. The heavy snow in Tianjin also shows this." Captain Lee told reporters.
Compared to gasoline engines, the operating environment of diesel engines is more complex and diverse. “We cannot change the environment, nor can we guarantee that the engine will be used in a normal environment. Therefore, when we develop products, it is clear that only products that can adapt to all environments are products that the market needs. We need to be able to become part of the extreme environment. Engine.†Bai Yun, deputy general manager of Dongfeng Cummins Engine Co., Ltd., made his own interpretation of the relationship between the environment and the product. After the test of the heavy snow weather in the north, Dongfeng Cummins Engine's outstanding performance in the extreme environment verified his statement.
The low temperature is the first "challenge." In the cold state, the engine is often difficult to start or simply can not start. Dongfeng Cummins, in the development of each product, first of all undergoes long-term and extensive performance tests, exposing the defects of the engine and potential hidden dangers fully and completely, and then passing through several improvements until various new ones. The old problem no longer appears. After loading the prototype, the road tests under extreme conditions such as alpine, dry heat, hot and humid, etc., finally make the product fully meet the design goals. “When we were on the road test, the coldest we had was in Mohe, Heilongjiang, with a minimum temperature of -36.3°C; the hottest thing was Turpan.†White Source told reporters.
In addition, Cummins Engine has a hundred years of history so far, with products all over the world. It can be said that a variety of unconventional geographical and climatic conditions are likely to occur in the distribution area of ​​Cummins products and will be considered in the development process. This is also the reason why the engines of other brands have “strikes†in this heavy snowfall, and the Dongfeng Cummins engine is still an important reason for its normal operation.
Second, as soon as snow falls on the road, it is difficult for the road to freeze, and buses often run at low speeds and brakes frequently. This requires the engine to have good low-speed torque performance. Dongfeng Cummins electronically controlled engines have been specially developed for the characteristics of public traffic conditions, making it more convenient for power release at low speeds. In this snowy day, if buses are broken down on the road, not only passengers are frozen but traffic jams are more likely to occur. Therefore, fewer failures and higher reliability are another important requirement for the bus to the engine. In terms of reliability, Dongfeng Cummins has a unique advantage: its engine is less than 20% of the engine parts of other manufacturers. Not only does the engine size become smaller, but it also saves the space of the entire vehicle, and more importantly, there are few connections between components. The probability of friction loss is greatly reduced, and the probability of failure is also reduced.
“These buses have been in operation for more than two years. There has never been a case of stopping at high speed due to breakdown. Failure at high speed is the most vexing headache. In our Tianjin dialect, our car is at high speed. It is simply 'invincible'." Captain Lee said that if the Tianjin Binhai Bus Company needed to add new buses, the Dongfeng Cummins Engine was still his first choice.
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