Driver Cab Display Verification Using Power-of-Two Check Codes
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Solution Overview
Problem
Existing methods for monitoring displays in a driver's cab of a means of transport lack reliability, as they fail to accurately verify the correctness of displayed information, particularly in ensuring accurate representation of critical parameters like speed and kinematics, which can lead to safety issues.
Innovation Solution
A method that generates and verifies check codes based on image information using power-of-two assignments and tolerance intervals, ensuring that the displayed visual representation of process variables aligns with expected values, thereby classifying representations as correct or incorrect through bitwise comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional test methods using lookup tables are used to monitor display correctness, then the monitoring process can be implemented, but the reliability of displayed information is insufficient and incorrect data may be presented to the driver
Solution Approach 1:
The patent replaces conventional mechanical lookup table methods with a mathematical field-based verification system. Instead of using pre-stored test codes in lookup tables, the invention calculates expected check codes mathematically from process variables using polynomial functions and modular arithmetic. This substitution enables more reliable verification by establishing a deterministic mathematical relationship between process variables and display content, eliminating the reliability issues of conventional methods.
2Reliability
If detailed verification of displayed information is performed to ensure accuracy, then reliability improves, but the complexity of the monitoring system increases
Solution Approach 1:
The patent transforms the verification approach by changing parameters from complex image processing to simple mathematical operations. The system uses polynomial functions with coefficients derived from process variables to generate expected check codes. By comparing these mathematically generated codes with actual display check codes, the system achieves detailed verification through simple parameter comparison rather than complex system architecture, thus improving reliability without significantly increasing device complexity.
Solution Approach 2:
The monitoring system performs self-verification by using the process variables themselves to generate the verification codes. The display control unit and monitoring unit work together where the display system generates its own expected check codes from the process data it displays, and the monitoring unit independently verifies these codes. This self-service approach enables comprehensive verification while keeping the system structure relatively simple, as the system verifies itself rather than requiring external complex verification infrastructure.
Data Source
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AI summary
The invention relates to a method for monitoring a display of a driver's cab (40, 50) of a means of transportation. In the method, a target process quantity (S-PG) is captured and a pictorial representation (BI) is produced by a display device (43, 51, 52). Furthermore, an actual test code (I-PC) is calculated from the pictorial representation (BI). By means of the calculated actual test code (I-PC), a clearly associated power of two (ZP) is determined by means of a first table (TAB1). In addition, a target process quantity (S-PG) produced by a vehicle control device (41) is captured. A power-of-two sum (ZPS) clearly associated with the target process quantity (S-PG) by means of second table (TAB2) is determined on the basis of the target process quantity (S-PG). Finally, it is checked whether the pictorial representation (BI) is correct by determining whether the power of two (ZP) associated with the actual test code (I-PC) is contained in the power-of-two sum (ZPS). The invention further relates to a display device (43, 51, 52). The invention further relates to a driver's cab (40, 50) for a means of transportation.