Science and technology is the vital core of buses. Yutong has the domestically greatest capacity of research and development to provide dedicated combination of edge-cutting technology with bus products so that all customers are more confident about the quality of their purchased Yutong buses.

Science and technology elites from various fields create value-maximized products for you

The first post-doctoral workstation in China’s bus industry

In April 2000, Yutong established the first post-doctoral workstation in China’s bus industry to direct and verify the design and development of products.

Hundreds of millions investment creates technical flagship in China’s bus industry

Yutong has the first state-level technology development center in China’s bus industry. Every year, Yutong pours hundreds of millions money in R&D. Up to now, it has been granted approximately one hundred patents.

All-terrain road simulation test of chassis

Yutong is the first China’s bus manufacturer to introduce the all terrain road simulation test rig of chassis, which can carry out various actions including run-out, turning and braking of wheels under all simulated road conditions. The six-freedom-degree simulation is capable of verifying the reliability of vehicle frame, axles, leaf springs, air bags, shock absorbers and stabilizer bars.

Wind tunnel test

Wind resistance is one of the main factors that affect the high-speed performance of buses, including its fuel economy. Yutong Calculation Center conducts relevant digital simulation calculation to reveal the aerodynamics performances of buses, such as the characteristics of air flow field, air flow rate distribution and air pressure distribution around the bus. The wind tunnel test can be used in the optimization of bus shape to reduce wind resistance and fuel consumption.

Domestically-first collision test

At the beginning of 2009, Yutong ZK6127H bus underwent the cab hammer collision test and the sideward rollover test at the National Automobile Quality Supervision and Test Center. Yutong ZK6127H bus was the first one in China to undergo such tests. After the collision, the front wall was not obviously deformed, the engine could be normally started, and the manikin could be placed in the cab. Therefore in case such a collision really occurs, the driver will not be squeezed, in other words, he still has safety space and can evacuate from the cab. The rollover test was carried out in accordance with GB/T17578-1998, with rollover critical angle being 36.5°.
Yutong conducted the two tests to investigate passenger car safety. This has promoted the complete-car safety research in the whole passenger car industry.

All-terrain road simulation test of whole vehicle

Never take the market as test track”. Before model finalization, Yutong buses undergo a series of simulated destructive tests. Yutong buses are tested under simulated all-terrain road simulation for one million kilometers within 25 days. These destructive tests are intended to enhance reliability of whole vehicles and reduce repair and maintenance cost. It is the continual self-improvement that brings Yutong buses to perfection.

Introduction to electrocoating

As the leader in China’s bus industry, Yutong introduced the fully-automatic electrocoating line from DURR in Germany. The annual production capacity of the electrocoating line is 50,000 buses with body length up to 13.7 meters. This cathodic electrocoating line for buses is the most advanced and largest one in the world.

More endurable with lasting beauty

The electrocoating process includes three major steps to provide multi-layer protection without any omission. The resistance to salt spray is more than 1000 hours after treated with electrocoating process, thus greatly enhancing the anticorrosion and antirust performance.

Highlights of Yutong’s electrocoating technology

● Largest electrocoating tank, which is 15 meters;
● Highest production capacity, which is 50,000 buses per year;
● Fully-automatic, which ensures the uniformity and stability of coating effect;
● Strong partnership: German DURR, etc.

Three major steps

The electrocoating process includes three major steps to provide multi-layer protection without any omission.

● Pre-treatment: The degreasing, rinse, activation, phosphating, and rinse again after phosphating provide the bus body surface with a compact while clean phosphating film, which ensures the good adhesion of coating thus enhancing the anti-corrosion capability of bus body.
● Electrocoating: To form a continuous, compact and flat coating film on bus body.
● Drying: High-temperature drying solidifies the coating film to vest bus with super anti-corrosion ability and excellent adhesion, , flatness, hardness and elasticity of coating film.

Creative design, economical operation

○ Chassis and electrics

The chassis workshop was put into use in 2008. The chassis plant adopts Toyota Lean management as well as many advanced techniques such as intelligent tightening, vacuumizing fueling, and leaf spring compression mounting, to greatly improve production efficiency, product quality and working environment.
There are two assembly lines in the chassis workshop and its daily production capacity is 180 units. The assembly lines adopt modern logistics mode that reasonably combines automatic conveying equipments with advanced technique to accomplish rapid and effective assembly.

○ Optimization of drive chain

Yutong offers a variety of drive chain modules in light of customer utilization conditions to ensure the power performance of buses and at the same time reduce fuel consumption.

○ Thermal management of engine

Considerably prolong the service life of rubber pipes and electrical lines inside the engine compartment, and eliminate the potential fire hazards caused by high temperature.

○ Improvement to pipeline arrangement

Yutong reasonably arranges gas, fuel and electrical lines. The tin-plated wire harnesses are used for chassis electrics to increase their reliability and prolong their lives, thus substantially cutting repair and maintenance costs for customers.

Application of edge-cutting technology to provide“value-added”products

○ CATIA design software

The cutting-edge 3-D design software CATIA was used to design Phantom planes. Nowadays Yutong technical staff use this software to design buses. The digital simulation calculation in conjunction with wind tunnel test can optimize bus shape to increase its load factor, reduce air resistance and save fuel hence enhance cost effectiveness.

○ CAE research of bus body

Yutong undertakes lots of finite element analysis of bus body structure. The finite element analysis model has 111,071 nodes and 105,452 units including 1,726 units for beams, and enables Yutong to accurately measure the stress at any location of bus body.

○ First collision and rollover tests conducted in China’s bus industry

Yutong is the first one in China to undergo the cab hammer collision test. After the collision, the front wall was slightly deformed and the manikin was not squeezed. The rollover test was carried out for many times, with bus rollover critical angle being 42° (national requirement is 35°). After the rollover test, the frame is very slightly deformed and the bus can run normally. The performance has attained European standard, bringing higher safety and reputation to customers.

○ 9-4-6 fire hazard prevention system

Yutong always attaches great importance to fire prevention of buses. The expert team and post-doctoral workstation have invented the 9-4-6 fire hazard prevention system: 9 items against potential fire hazards, 4 measures to retard fire hazards and 6 ways for evacuation.

○ Ergonomics research

Yutong has set up diversified models in such aspects as seating comfort, field of view, leg space, chest space and maneuverability convenience to improve vehicle performance and operation quality.

○ Research on air conditioner performance

Yutong applies CFD technology to the calculation and simulation of air flow field of bus air conditioner. The six major adjustments uniformize in-bus temperature distribution, so that passengers would feel more comfortable.

○ Noise research

Yutong undertakes the internal and external noise test of buses on the material test rack once used for China Shenzhou V spaceship to minimize the influence of noise on passengers.

○ Research on ride comfort at high speed

Yutong carries out the research into vehicle body vibration and seats wobbling during the driving, and then takes proper preventive and corrective measures to bring the passenger transport quality to a higher level.