Automotive Questions

ABS [Antilock Braking System] An  anti-lock braking system  ( ABS ) is an automobile safety system that allows the wheels on a motor vehicle to maintain tractive contact with the road surface according to driver inputs  while braking, preventing the wheels from locking up (ceasing rotation) and avoiding uncontrolled skidding. It is an automated system that uses the principles of threshold braking and  cadence braking  which were practiced by skillful drivers with previous generation braking systems. It does this at a much faster rate and with better control than a driver could manage. ABS generally offers improved vehicle control and decreases stopping distances on dry and slippery surfaces; however, on loose gravel or snow-covered surfaces, ABS can significantly increase braking distance, although still improving vehicle control . Since initial widespread use in production cars, anti-lock braking systems have been improved considerably. Recent versions not only prevent wheel l

Instrument Panel In an automobile, an  electronic instrument cluster ,  digital instrument panel  or  digital dash  for short, is a set of instrumentation,  including the speedometer, that is displayed with a digital readout \ traditional analog gauges. Mercedes-Benz Cluster

Unified Diagnostic Services (UDS)  specifies data link independent requirements of automotive diagnostic services in road vehicles. UDS is codified in ISO 142291:2013 and allows diagnostics to control functions on an invehicle  Electronic Control Unit (ECU). Typical functions ECUs control are electronic fuel injection(EFI), automatic gear box, antilock braking system, etc. all connected to a serial data link embedded in a road vehicle. The diagnostic communication over controller area network (DoCAN) is specified in ISO 157653 and ISO 142293. What is Vehicle Diagnostics ? Modern vehicles are packed full of modules, all continuously  monitoring themselves and reporting their status. Detecting a failure in this complex machine would be a tedious task. However, most of the vehicles today include computers (Electronic Control Unit (ECU)), which monitors several sensors, located throughout the vehicle. When the computer system of the car detects a fault, two things are supposed to h

CAPL – CAN Access Programming Language Designed specifically to suit the CAN Applications The CAPL language allows you to write programs for individual applications (ECUs).  The system environment can be emulated with the help of CAPL in CANoe, e.g. the data traffic of all remaining stations can be emulated. CAPL Program   Structure: Event Driven Procedural language with Special Purpose Functions Events: Time Events (Software Timers) I/O Events (Key Board, Parallel port, Serial Port ) CAN Communication Events (Messages Errors) CAPL Browser Provides the Complete Development environment for CAPL Programs. A CAPL program consists of two parts: Declaration of global variables Declaration of user-defined functions and event procedures Declaration and Initialization of Global Variables: Global variables are declared in the global variables pane at the upper right. The data types  DWORD, LONG, WORD, INT, BYTE  and  CHAR  can be used analogously to their use in the C

CANoe Tool Architecture: The right portion of the diagram is similar to the architectural model for CANalyzer . Just as in CANalyzer ,  The CANoe is also adjustable and completely under your control to be modified. In addition to analysis, CANoe also provides a separate window for simulation activities. You also have full control over simulation window. Simulation Setup: In the simulation setup window, the overall system is displayed  graphically with the buses and all network nodes.All options for parameterizing the simulation setup are selected in this window. Differences b/w CANalyzer and CANoe: 1. Level of Node Control: A Single CANalyzer tool can acts as a single network member, But CANoe has no limit as to the number of modules with which it may substitute. 2. Graphics Panels: CANoe allows you to construct tester panel interfaces to give inputs and  outputs. You can add the necessary CAPL software to interconnect your switch presses to the corresponding CAN transm

Introduction: CANalyzer  is the universal software analysis tool for ECU networks and distributed systems.  CANalyzer  makes it easy to observe, analyze, and supplement data traffic in CAN, LIN, MOST, or  FlexRay systems. With powerful functions and user-programmability, all needs are covered from simple network analysis to advanced troubleshooting of complex problems. Architecture: In the course of a measurement the bus interface registers messages on the bus and passes them to the specified paths in the data flow plan and on to the evaluation and analysis blocks at the far right of the plan. During a measurement two program modules work closely together to this purpose: First the real-time library retrieves the information arriving at the card, provides them with a time stamp and shifts them to a buffer. In a second step these data are read out by the actual main program and are evaluated in the function blocks on the right-hand side of the data flow plan. You can influen