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In the repair community, there is a saying: “The apprentice checks fault codes, while the master checks data streams.” Although we may not reach the master level immediately, stories of apprentices surpassing their masters happen from time to time. According to the control principles of the ECU, data parameters are divided into input parameters and output parameters. Input parameters refer to the various parameters input to the ECU from sensors or switch signals. Input parameters can be numerical or status parameters.
Parameters in the data stream can be classified according to the various systems of the vehicle and engine, and the analysis methods for different types or systems of parameters vary. When diagnosing faults in electronic control devices, it is also necessary to conduct a comprehensive comparative analysis of several different types or parameters. Today, we will unveil the mystery of the data stream of “torque limiting”…
1. What is “Torque” and How to Understand “Torque”:
Let’s start with the basics: what is torque? The power of the engine is generated by the thrust of the piston produced by fuel combustion, which drives the vehicle. Masters can think of the force produced during this work as torque. It’s similar to how much force you exert when pedaling a bicycle.
If the load is very light, it is easy to ride the bike quickly.
If it is under a high load condition, more force is needed to release greater torque to drive the vehicle.
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In addition to considering the torque required to ensure the engine operates normally, it is also necessary to consider additional torque from various accessories such as air conditioning, alternators, and various torque limits. This requires a torque coordinator to adjust and calculate the torque demand.
The diagram above illustrates the structure of engine torque transmission. After the system obtains the output torque required by the engine, it undergoes coordination through the engine torque limiter and then is adjusted by the ASD to obtain the final required torque. Finally, the ECU converts the final required torque to determine the necessary fuel injection and intake amounts.
The function of the ASD regulator in the diagram is mainly to prevent sudden changes in vehicle torque that can cause speed fluctuations or vehicle vibrations. Its built-in ASDrf and ASDdc modules are responsible for adjusting signal delays and filtering interference signals, keeping torque transitions smooth and improving driving comfort.
