Duty cycle control technology In my memory, as early as 1996, the duty cycle control technology has been used on the cars produced by General Motors. Today, this technology has been very mature, and its application scope is gradually popularized.Today, this technology has been used in many domestic models. Now I would like to introduce my understanding of this technology to you. I hope it can serve as a reference for maintenance personnel who have not mastered this technology.Then my goal will be achieved. 1、 What is duty cycle control? modernThe control accuracy of automobiles is getting higher and higher, especially in the electronic control system, some commonswitchThe type of actuator can no longer meet the requirementsmodernCar control requirements, such as EGR system, idle speed control system, fuel evaporation control system, etc To be precise, the duty ratio control should be called: electronic control pulse width modulation technology, which is used to modulate the pulse width of the voltage signal with a certain frequency applied to the operating actuating element through the electronic control device, so as to achieve accurate and continuous control of the operating state of the controlled actuating element.Shanghai GM in recent yearsBuickThe linear EGR system adopted by the car actually uses this technology to realize the linearity of EGR valveswitchFunction. So why do we call the electronic pulse width modulation technology duty cycle control technology? In fact, duty cycle is an extension of electronic pulse width modulation, and duty cycle essentially refers to the percentage of the time that the controlled circuit is connected to the whole circuit working cycle.
2、 Some information you must know 1. Pulse width is the actual working time when the circuit is connected or the controlled circuit works in a working cycle.In the automotive electronic control system we discussed, the pulse width should be millisecond. 2. Average working voltage, which is the average value of the voltage applied to the working circuit of the controlled circuit in a working cycle after being modulated by the electronic control system. 3. Working voltage, in the automotive electronic control system, the working voltage is the constant voltage value that the control unit applies to the actuator or the controlled circuit.The working voltage of the controlled circuit may be divided into 5V, 8V and 12V according to the different functions that the controlled circuit needs to complete.
3、 Classification Positive duty cycle control.In the DC circuit, the end where the controlled component is connected to the power supply is called the power input end here, and the end where the working ground wire is connected is called the power output end. The so-called positive duty ratio control is to control the power input terminal of the controlled component;On the contrary, the control of the power output is called negative duty cycle control. 4、 Description The duty cycle control technology has a wide range of applications. The above is just a brief introduction to the application of this technology in the automotive field. In the actual maintenance work, the detection of this control system requires some skills, and the following points should be noted: A - When we test this control system with a multimeter, the voltage value of the controlled component you measured is actually its average working voltage. B、Although the working voltage of the control module is constant, if you use a multimeter to test, it is impossible to read its working voltage, which does not mean that the control system has been damaged or has a problem. C、If you want to achieve accurate duty cycle control, the control system must have a constant operating frequency.
So far, we can sum up a complete concept of duty cycle control - by controlling the duty cycle of the DC working voltage with a constant working frequency in a working cycle (that is, the control of the DC pulse width), we can use the electronic control circuit to control the high-speed switching action, thus controlling the time ratio of the controlled circuit to turn on and turn off,The average value of the operating voltage of the controlled components is controlled. In fact, it controls the operating current value flowing through the controlled element.
Because the duty cycle control can realize the linear control of the average value of the working voltage of the load, it can control 0 to 100% of the arbitrary positions of most switch actuators used in our vehicles.
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