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Green Vehicles

To effectively reduce the waste gas pollution from diesel vehicles, vehicles with several kinds of clean alternative fuel
engines have been successfully researched and developed. The Environmental Protection Administration also established a scheme to subsidize local governments for introducing different types of vehicles listed below for test running in order to evaluate their effects and possibility with respect to the mass transportation system:
CNG bus:
It uses compressed natural gas (CNG) as fuel to substitute for the diesel oil for the traditional diesel engine.
Advantage:
It emits only CO2 and H2O after combustion, so it is able to reduce HC and NOx pollution effectively.
Shortcoming:
(1) There must be a big space for a vehicle to accommodate the cumbersome CNG tank.
It is not suitable for small vehicle.
(2) Special CNG filling stations must be installed, so it is not easy to promote widely.
Electric Bus:
It replaces the traditional diesel engines with the battery-driven motors.
Advantage:
(1) Cleanliness: No problem of waste gas emission.
(2) Quietness: Low noise and vibration.
(3) Convenience: The threshold for establishing charging stations is far lower than that for
establishing CNG filling stations.
Shortcoming:
(1) Insufficient battery life: The battery technology still needs breakthrough and improvement.
(2) Long charging time: It needs to develop and introduce the quick charging system continuously. (3) ts power
performance is not as good as that of a diesel engine and a CNG engine.
Hybrid bus:
This bus combines two power systems (which can be diesel engine + CNG, diesel engine +
electric power system, etc.)
Advantage:
Both power systems are switchable to cope with different driving conditions or increase the driving distance.
Shortcoming:
(1) It requires higher technical standard and thus increases the cost (due to the use of the two power
systems).
(2) It still must be used together with the diesel engine or diesel generator, so it can produce only
limited effects in reducing the waste gas pollution
Derived benefits from clean vehicles:
Environmental Protection Benefits:
(1) Reduce the emission of traditional air pollutants (CO, Nox, HC, …)
(2) Eliminate CO2 emission and reduce the greenhouse effect.
(3) Replace the ole diesel bus of high-pollution gradually.
Energy Saving Benefits:
(1) Raise energy efficiency.
(2) Promote multi-utilization of energy
(3) Reduce the dependency on petrochemical fuels
Industrial & Economic Benefits:
(1) The government provides preferential tax incentive measures
(2) The industry can promote its industrial technology and development
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