search.noResults

search.searching

dataCollection.invalidEmail
note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
FEATURE SWITCHES, DISPLAYS & UIS


INCREASING TRAFFIC EFFICIENCY ON CHINA’S EXPRESSWAYS


ZFdiscusses how its sub-subminiature switches are being used in electronic toll collection “The DG sub-subminiature switch from ZF Friedrichshafen


AG is installed in the transponder for each vehicle, and is used as a core component to prevent disassembly”


I


n 2019 it was announced in China that by the end of the year, 90% of vehicles


on Chinese expressways should be enabled to use their new Electronic Toll Collection system. The Ministry of Transportation of


China planned a complete removal of manual expressway toll booths, replacing them with ETC systems not only at provincial borders but also at every city´s toll station. This has several advantages with the overall goal to reduce logistical costs, by reducing traffic congestion and enhancing traffic efficiency. To implement the electronic toll


collection process three main elements are required: First, electronic readers, which are installed on the roof of the toll station, the so called Road Side Unit. Second, a unique transponder is installed into each vehicle - the On Board Unit (OBU). Third, the driver is required to apply for a dedicated bank card to activate the payment from the individual’s account. By means of automatic RF


communication between the Road Side Unit at the toll booth on the expressway, and the On Board Unit fitted into the vehicles, drivers no longer need to stop on the expressways to manually pay the toll fee. The electronic reader creates a


28 NOVEMBER 2020 | ELECTRONICS


high frequency alternating electromagnetic field. Within this field the reader can give commands and the transponder in the car reacts by giving corresponding information. The Electronic Toll Collection system recognises the vehicle details and deducts the toll fee automatically. The On Board Unit is powered by the vehicle battery and a memory card is integrated with information about the drivers’ licence plate for clear vehicle identification. The


Figure 1:


Electronic toll collection process


unique transponder is required by the Ministry of Transportation of China to protect the security of the unique ID and account of each vehicle. The DG sub-subminiature switch


from ZF Friedrichshafen AG is installed in the transponder for each vehicle, and is used as a core component to prevent disassembly. As soon as the On Board Unit is pressed against the window, the DG switch is also actuated which leads to a working state. As soon as the On Board Unit is removed from the window and the switch actuator is released, the On Board Unit switches to the failure-state. Due to the release of the switch


Figure 2:


The DG sub- subminiature switch


actuator, an internal circuit deletes the memory card including the information of the licence plate. Therefore, it cannot be implemented into another vehicle as no clear identification can take place within the Electronic Toll Collection system, until the On Board Unit is renewed by the corresponding authority. The DG sub-subminiature switch fits


perfectly for this kind of application due to its extremely small dimensions (only 12.8 × 5.8 × 6.5mm), so it fulfills the tough space requirements of the transponder. At the same time the breaking capacity ranges from switching currents and voltages up to 3A and 125V AC.


ZF www.sensors.zf.com


/ ELECTRONICS


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46