求翻译：为提高整车动力性及经济性，中国重汽在WD615高压共轨系列柴油机基础上实现了低转速、大扭矩。优化了柴油机万有特性曲线，对整车重新进行了优化匹配。动力性和经济性均达到了设计指标是什么意思？

To improve vehicle dynamics and economy, China's heavy truck in WD615 series diesel engine common rail high pressure based on the low-speed, high torque. Optimized and there are characteristics of diesel engine, optimized for vehicle re-match. Power and economy are met the design targets

auto engine to improve sexual and economic in nature, the Chinese Hauler WD in 615 series high pressure common rail diesel engines were based on low-speed, high-torque. Optimization of 10,000 diesel engines have a characteristic curve, the whole car re-optimized for matching. Motive power, and econo

In order to enhance the entire vehicle power and the efficiency, the Chinese heavy steam has realized the slow-speed of revolution, the great torque in the WD615 high pressure altogether axle series diesel engine foundation.Optimized the diesel engine ten thousand to have the characteristic curve, h

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To improve vehicle dynamics and economy, China's heavy truck in WD615 series diesel engine common rail high pressure based on the low-speed, high torque. Optimized and there are characteristics of diesel engine, optimized for vehicle re-match. Power and economy are met the design targets