German CHECKTRON ADVANCED sensors, CHECKTRON ADVANCED models, CHECKTRON ADVANCED prices

CHECKTRON ADVANCED sensor is a sensor that measures the air flow drawn into the engine. For electronically controlled gasoline injection engines, to obtain the optimal mixture concentration under various operating conditions, it is necessary to accurately measure the amount of air drawn into the engine at every instant, using this as the main basis for the ECU to calculate (control) the fuel injection quantity. If the air flow sensor or its wiring fails, the ECU will not receive the correct intake air signal, preventing normal control of the fuel injection quantity, which will cause the mixture to be too rich or too lean, resulting in abnormal engine operation. Valve CHECKTRON ADVANCED sensor classification

1) Laser speed measurement: With the rise of precision manufacturing and the demand for cost savings, non-contact speed sensors are gradually replacing contact speed sensors. The most common and high-precision non-contact laser speed sensor currently on the market is the ZLS-Px aberration speed sensor. The aberration speed sensor has two ports: one emission port that emits a LED light source, and one high-speed imaging port that achieves CCD area high-speed imaging comparison. By comparing images at two points in time within an extremely short period, the distance the measured object moves is determined, and combined with the algorithm inside the sensor, the speed of the measured object is output in real time. As shown in the figure, (1) is the LED light emission port, (2) is the camera reception port, (3) and (4) are terminal blocks, and (5) is the fixing screw hole. The (1) LED light emission port emits laser light toward the measured object, which reflects to the (2) camera reception port; after receiving the signal, it is transmitted to the signal processor, which calculates the speed via an algorithm. The ZLS-Px aberration speed sensor can simultaneously measure speed and length in two directions. It can not only detect whether the measured object has stopped but also detect the direction of motion of the measured object. Mount the sensor on a stable bracket to ensure that the rotation of the rotating object does not produce excessive vibration, thereby allowing measurement of the rotation angle and rotational speed of the rotating measured object. 2) Radar speed measurement: Traditional speed measurement mostly involves rotary motion speed measurement and linear motion speed measurement. However, there are many irregular speed measurements in industrial automation, such as athlete speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed sensors can meet these requirements.

CHECKTRON ADVANCED sensor principle

The transmissive speed sensor consists of a slotted or notched disk, a light source, and a phototube. When the disk rotates with the measured shaft, light can only reach the phototube through the holes or notches. When the phototube is illuminated, its reverse resistance is very low, outputting an electrical pulse signal. When the light source is blocked by the disk, the reverse resistance of the phototube is very high, and no signal is output from the output terminal. Thus, based on the number of holes or notches on the disk, the rotational speed of the measured shaft can be determined. The usual number of disk holes or notches is unclear in the source, so when the measured shaft completes one revolution, the photoelectric converter outputs 60 pulse signals. If the time base signal of the electronic counter is taken as 1s, the rotational speed of the measured shaft can be read directly. The principle of the reflective speed sensor is the same as that of the transmissive type; it converts changes in sensed light into changes in electrical signals via a phototube, but it obtains pulse signals through light reflection. Typically, reflective material is adhered to the measurement area of the measured shaft to form a reflective surface. Commonly used reflective materials include special speed-measuring reflective paper tape (adhesive tape); aluminum foil or other reflective materials can also be used as substitutes, and sometimes white paint can be applied to the measured area to serve as a reflective surface. The projector and the reflective surface must be properly configured; typically, the distance between them is 5-15M. When the measured shaft rotates, the photoelectric element receives pulsed illumination and outputs corresponding electrical signals to the electronic counter, thereby measuring the rotational speed of the measured shaft. The waveform of the output signal from photoelectric speed sensors is relatively regular, close to a standard square wave, with almost no interference signals generated. However, vibration in transmissive types can reduce the lifespan of the light source, so they are not suitable for use under conditions with strong vibration. The reflective type has no mechanical connection with the measured shaft and is convenient to use.

CHECKTRON ADVANCED sensor industry applications

1) Modern vehicles are generally equipped with engine control, autonomous driving, ABS, TRC, automatic door locking, active suspension, guidance systems, electronic instruments, and other devices, all of which require vehicle speed signals. Therefore, the accuracy and stability of the output signal from the speed measurement sensor will have a significant impact on these control units. Automotive speed sensors mostly adopt a Hall-effect structure. A Hall speed sensor is a magneto-electric sensor based on the Hall effect, featuring high sensitivity to magnetic fields, stable output signals, high frequency response, strong anti-electromagnetic interference capability, simple structure, and ease of use. It mainly consists of permanent magnets with a specific number of pole pairs (generally 4 or 8 pairs), Hall elements, a rotating mechanism, and input/output connectors. Its working principle is that when the sensor's rotating mechanism rotates under external drive, it drives the permanent magnet to rotate, causing periodic changes in the magnetic field passing through the Hall element, which induces changes in the output voltage of the Hall element. Subsequent circuit processing forms stable pulse voltage signals, which serve as the output signal of the speed sensor. The main electrical technical parameters of Hall-structure speed sensors include: output signal high voltage, low voltage, duty cycle, period, rise time, fall time, and number of pulses per period. To ensure product performance reliability, quantitative testing of these parameters must be performed before factory shipment. Test systems featuring integration and intelligence, efficient automatic measurement, software calculation, and graphical or tabular display of test results are increasingly favored by automotive speed sensor manufacturers. A comprehensive detection device developed for performance measurement of commonly used Hall-effect vehicle speed sensors. Based on cost considerations, the high-speed counter port of a microprocessor is used for data acquisition from the vehicle speed sensor, and software control is used to implement calculation and graphical display processing of the acquired data. The completed detection device offers advantages such as high test accuracy, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, a simple and intuitive detection process, and low system development costs. It has good market promotion potential, so speed sensors will have huge application prospects in vehicle speed detection. 2) Speed sensors for belt conveyors adopt Hall sensors, which are sensors that utilize the Hall effect to achieve magneto-electric conversion. The Hall effect was discovered in 1879 and has a development history of more than 100 years, but its application gained attention and widespread adoption only in the 50s of this century due to the rapid development of microelectronics, leading to the continuous development of various Hall elements. China began increasing research on Hall elements in the 20s of the 70th century. After nearly several decades of research and development, it is now possible to produce Hall elements with various performances, such as general-purpose, high-sensitivity, low-temperature-coefficient, temperature/magnetic-field-measuring, and switching Hall elements. Due to the characteristics of Hall sensors, such as high sensitivity, good linearity, high stability, small size, and high-temperature resistance, they have been widely applied in various industrial fields, including non-electrical quantity measurement, automatic control, computer devices, and modern military technology.

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