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Horse and cart
| 题名： | Horse and cart |
| 正文语种： | eng |
| 作者： | Will Dalrymple |
| 摘要： | The expression 'putting the cart before the horse' implies that someone's actions are in the wrong sequence, or their priorities are wrong. The horse goes first because it pulls the cart, which can't take itself off. Through mechanisation, that relationship has endured. Although modern trailers can be quite sophisticated - and sport their own ECUs to control braking performance on each axle, for example -they continue to be the inferior party, receiving power, data and air signals through Suzie connections over the fifth wheel. This makes sense. Not only is the driver sitting in the tractor, so is the engine, the drivetrain control intelligence, as well as the steered and driven axles. That ability comes at a price; tractors may cost ten times as much as do the trailers holding the goods that they haul. For that reason, while tractors need to be in constant motion to repay the investment, trailers can be left parked up, compensating for the vagaries of the logistical supply chain. In this view, trailers are dumb, empty and replaceable. But electric powertrains are challenging the status quo, in the form of trailer e-axles. These systems collect energy from regenerative braking and store it in a battery on the trailer, which can then be used to reduce parasitic loads such as powering a fridge. BPW and Thermo King's system is called ePower; ZF's is eBeam;SAF'sTRAKr. |
| 出版年： | 2023 |
| 期刊名称： | Transport engineer |
| 期： | Nov. |
| 页码： | 5-5 |
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