Huf Baolong Electronics Bretten TSSSG4G5 Tire Safety System User Manual Requirement Spec BMW GEN3 P02616 016 01 28g

Huf Electronics Bretten GmbH Tire Safety System Requirement Spec BMW GEN3 P02616 016 01 28g

User Manual

BERU Electronics GmbH page 1 3 HL_10000 System and functional description 3.1 SR_10001010 - System description The third generation system consists of just 5 components. It meets current EMC and radio guidelines as well as legislative requirements (especially NHTSA FMVSS 138). The compact control unit has an integrated receiving antenna. The RF receiving properties are designed to ensure axle detection is possible for a wide range of vehicles by means of evaluating the reception level. The wheel electronic units belonging to the system use a high-integrated sensor (HIS) with pressure and temperature measurement, 2-axle acceleration measurement, LF receiver, RF transmitter, power management, and integrated µC. The primary function of the system is monitoring tire inflation pressure while the vehicle is in operation. The most important additional function of the system is the capability of detecting the wheels installed on the vehicle (own wheels) and their installation location automatically. The compact control unit is installed at a non-centralized location in reference to the vehicle axles. The reception level of the RE is rated statistically to detect the mounting location of the wheel electronic unit. This process determines the average value of the received field intensity of the individual RE. After a certain number of telegrams, the system checks which wheels were received at higher (average) reception levels and which were received at lower reception levels. The higher reception levels were received from the REs which are installed closer to the receiving antenna. This makes it possible to allocate wheel electronic units for the front or rear axle. Direction of rotation is detected within the wheel electronic unit itself. The RE contains a 2-axle acceleration sensor that measures radial and tangential acceleration, from which it derives the direction of rotation. 3.2 SR_10003010 - Functional requirements for TSS system Gen3 Following are the most important functional requirements for the third generation system: • Pressure/temperature in the wheel • Rapid availability of pressure warning information, self diagnostics, and wheel management • Automatic own wheel detection, typically within the first minute after the startup process • Independent axle detection by evaluating average levels • Independent wheel position allocation, typically within the first minute of driving at > 30km/h after the startup process in normal road traffic and pavement surface • Independent wheel position allocation within the first 12 min of driving at > 30km/h after the startup process • Calibration of tire pressures • Probe calibration (via bus command) • US warning algorithm • Connection to the vehicle bus via CAN bus • Fast and reliable diagnostics of components • Flashing in Customer Service • Reliable process for simple mounting of wheel electronic unit • Diagnostics via CAN
BERU Electronics GmbH page 2 4 HL_20000 Wheel electronic unit (RE) This section contains excerpts from the RE specification G3Only; for current version see SR_1003060. 4.1 HL_0700001 General information about RE 4.1.1 SR_07000010 – General description of RE HIS The wheel electronic units are mounted inside the tire. They measure tire inflation pressure, temperature, direction of rotation, and their battery voltage. Each wheel electronic unit has its own ID which is sent along with each data transmission. Data is transferred at high frequency in the range of 433MHz, in the so-called ISM band, or in the range of 315MHz in some countries. The wheel electronic unit measures the tire inflation pressure at regular intervals (for example every 3s) and the wheel electronic unit temperature and sends the resulting data at a regular transmitting interval (for example every 30s) or upon trigger request (LF 125kHz) from the tire. If there is a change in pressure > 20kPa within two successive pressure measurements, the wheel electronic unit immediately switches into fast transmitting mode. In this state the wheel electronic unit measures and transmits the data from the tire described above at short intervals (1s). This process ensures that a system with relatively little measurement data transmission is still sufficient for monitoring tire inflation pressure, because it is also able to detect a rapid drop in pressure. The wheel electronic unit has two acceleration sensors to detect rotary movement and direction of rotation. Detection is possible during the startup process or while driving. When the direction of rotation is detected, a telegram burst is sent (see SR_0702001). The wheel electronic unit and software are designed for minimum power consumption. The selected battery is typically able to ensure a service life of 10 years. Power management supports the transmitting function even towards the end of service life and at low temperatures. 4.1.2 SR_0700002 - Development goal of RE The current EMC and radio guidelines (see section "Release tests") and legislative requirements (especially NHTSA FMVSS 138) in force at the time of development must be observed. Pressure measurement range 0.05 to 6.375 bar abs. Temperature measuring range -40 to +120°C 4.1.3 SR_0700401 - Application range of RE The wheel electronic unit is designed for installation in passenger car wheels. The flexible connection between the valve and housing makes mounting possible in most rims between 14" and 21". Due to the wide variety of rim shapes, checking through the vehicle manufacturer is required in each case to determine whether the wheel electronic unit can be mounted.
BERU Electronics GmbH page 3 4.2 HL_0702800 Modes 4.2.1 SR_0702801 - Operating modes The wheel electronic unit can assume different operating states. Mode 0: Storage mode/test mode Mode 1: Normal operation, for operating while stopped or driving Mode 2: Fast transmitting mode after a fast change in pressure is detected Mode 3: Fast transmitting mode before an overtemperature shutdown Mode 4: Control data burst/ detection of direction of rotation in startup process 4.2.2 SR_0702806 – Constants M = 3 O = 40 P = 1 R = 25 T = 20 U = 10 Y = 5 Z = 5
BERU Electronics GmbH An important characteristic of the states described above is that driving safety is no longer ensured. The driver is prompted to stop and check the condition of the tires. It is the driver's responsibility to decide whether he or she can continue at a slower speed to the next repair station or whether on-site repair is required. 5.5.7 SR_44000070 - More than one tire at minimum pressure As soon as more than one tire has fallen below one of the set warning limits, the non-specific low tire warning is generated, meaning the position of the wheel(s) is not specified. If a position-specific warning is already pending, it is replaced by the non-specific message when the second warning event occurs. The non-specific low tire warning also causes the fKL and vKL to come on in the instrument cluster and remain lit. In addition, an acoustic warning (gong) sounds with each low tire event. The message "Tire low!" without position also appears in the Check Control. All wheels now appear in yellow in the MMI. 5.5.8 SR_44000080 - Response time of low tire output As in previous systems, a low tire warning is not generated until the pressure value has fallen below the warning limit twice in succession. This "freak filter" prevents unjustified low tire warnings that could otherwise be triggered by external factors such as extreme driving maneuvers. Since the normal transmitting interval of the RE is 30s, the response time is therefore typically one minute. If the RE is in fast transmitting mode, the response time is reduced accordingly. Requirements Section 15.19: Labelling requirementsThis device complies with Part15 of the FCC Rules.Operation is subject to the following two conditions:(1) this device may not cause harmful interference, and(2) this device must accept any interference received, including interference that may cause undesiredoperation. Section 15.21: Information to the userThe user manual or instruction manual for an intentional or unintentional radiator shall caution the user that changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.IC statement according to RSS2105.11 User ManualOperation is subject to the following two conditions:(1) this device may not cause interference, and(2) this device must accept any interference, including interference that may cause undesired operation of the device

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