TPM-167 Tire Pressure Monitoring System User manual
1. Description 1.1 Application System to check the pressure of all tyres of a passenger car that have a gross vehicle weight rating of 4,536 kg or less, to warn drivers of significant under-inflation of tires (and the resulting safety problems). If there is a malfunction of the TPMS the driver has to be informed that there is a malfunction of the system.
1.3.3 Normal operation After startup of the system, the display must indicate the status of each tire, including its pressure and temperature in once cycle. For each tire and each condition, the information must be displayed at least one second. After this cycle, the system should switch to ordinary operating mode, thus switching the display to blank, unless there are any errors or malfunctions.
whenever he pushes the button. After this minute the “Pressure Warning” icon will be shown continuously. During this whole period, the 3-digit 7-segment section will show the current pressure of this tire. Additionally the backlight of the display will change to yellow to comply the requirement of FMVSS 138. This complete procedure will be repeated after 5 minutes until the condition is improved or the driver pressed the button “CHECK”.
1.3.5.2 Pressure alert stage two If one or more tires’ pressure drops 50% or more below the preset reference pressure, a pressure alert must be triggered. A 3 Step Indication procedure will be used to highlight this conditions: Step 1. The “Pressure Warning” icon will be shown and the icon of the corresponding tire will blink for 90 seconds and beep at the same frequency (1 Hz) for 15 seconds. The driver must be able turn off the beeping whenever he pushes the button. Step 2.
spare tire, the 3-digit 7-segment section will show nothing and the backlighting will turn off after one minute. 1.3.5.3 Rapid loss of pressure If one or more tires are reporting a pressure loss of 0.2 bar or more within 60 seconds, the system must alert the driver of a fast leaking tire. A 3 Step Indication procedure will be used to highlight this condition: Step 1.
1.3.5.4 Over Pressure alert If one or more tires’ sensors are reporting a pressure that exceeds 125% of the preset reference pressure or the tire type specific maximum pressure (Table 1), the system must alert the driver. A 3 Step Indication procedure will be used to highlight this condition: Step 1. The “Over Pressure Alarm” and “Pressure Warning” icon will be shown and the icon of the corresponding tire will blink for 90 seconds and beep at the same frequency (1 Hz) for 15 seconds.
spare tire, the 3-digit 7-segment section will show nothing and the backlighting will turn off after one minute. There is no over-pressure alert available if the reference value is 430 kPa or above. 1.3.5.5 Tire temperature alert If one or more tires are reporting a temperature in excess of 85°C (185°F), the system must alert the driver. A 3 Step Indication procedure will be used to highlight this condition: Step 1.
1.3.6 TPMS malfunction A general malfunction is present, if, for example, a sensor’s signal has not been received for more 15 minutes or if the input voltage of the system exceeds or undershoots a range of between 9.5 and 15.5 Volts. In this case, and in accordance with FMVSS 138, and 2.3.3.7 the “Pressure Warning” icon will blink for one minute and beep in the same frequency for 15 seconds. The driver must be able turn off the beeping whenever he pushes the button.
1.4.3 Symbols and fields 1.4.3.1 Vehicle view symbol The display must provide a schematic birds-eye view of the vehicle with oversized icons depicting the tire positions of up to seven tires (front single tires, rear double tires, spare tire). The vehicle view icon must be designed in a way, so that it is clearly visible, which side is the front and which one is the rear. The vehicle must be visible at all times during the operation.
Symbol “Pressure Warning”: Symbol “Fast Leaking”: Symbol “Temperature alert: 1.4.3.5 Transmission status field The transmission status field is a warning for the driver, in case one or more sensors’ signals have not been received for a prolonged period of time. The transmission status field must be an antenna symbol, optionally accompanied by bars, indicating the transmission strength or number of signals received by the system. Transmission status symbol: 1.4.3.
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