Keywords: technology latest patent emission teaching simulation device
The invention relates to an automobile CAN data analog signal generating device, in particular to an automobile emission ECU signal simulator.
Background technique:
The ECU signal simulator can simulate the output of the engine simulation signal to the automotive engine ECU control unit to test the function of the ECU's online emission terminal and meet the compliance requirements. The traditional ECU signal simulator can only send the simulated vehicle speed value through the ECU through a diagnostic request. The simulated vehicle speed value cannot be changed linearly. Generally, only three high, medium and low vehicle speed values are provided, which is difficult to meet the test requirements. In addition, the signal simulator cannot learn the frame The number and actual speed are based on the subjective perception of the person, but they cannot accurately understand the changes in speed and actual pressure. More importantly, the current ECU signal simulator on the market does not provide the vehicle speed and engine speed analog signals and the frame number required by the ECU for the emission system (three-way catalyst, oxygen sensor voltage). The displayed signal simulator exists The disadvantage of limited use.
Technical realization elements:
In response to the above technical problems, the present invention provides a vehicle emission ECU signal simulator that can meet the requirements of the emission and ECU control unit, the output signal can be linearly adjusted, and has a wide range of applications.
An automobile emission ECU signal simulator provided by the present invention includes a portable host, which does not require a digital display unit, function selection buttons, adjustment knobs, and is used to output a three-way catalyst signal and an oxygen sensor voltage signal to the automobile ECU Output interface, analog digital signal output interface for outputting emission signals to emission ECU, and CAN bus interface for outputting analog speed value and frame number information to electronic control ECU and receiving returned speed value, MCU is provided in the portable host The main controller and the MCU main controller are respectively connected to the power management unit, the flashing machine interface, the signal output interface and the CAN bus interface. The MCU main controller is also provided with a suggested connection module to realize fast connection.
As a preferred embodiment, the portable host is also provided with a serial port interface for communication with a PC, and the MCU main controller is connected to the serial port interface.
According to the actual vehicle environment, the normal voltage of the oxygen sensor is in the range of 0.1-0.9V, and the average value is 0.4-0.5V. One packet every 1 second.
HEX 14,15 output two voltage values
HEX 14 is greater than 15
Set the normal working temperature of the three-way catalyst is 400 ℃ ~ 600 ℃
HEX 3D, 3E (random)
The above logic is a preferred embodiment, and the MCU main controller is connected to the emission signal output interface through an isolated output circuit.
The beneficial effects of the present invention are: the present invention is a portable device, which is flexible and convenient to use; it can output corresponding signals for laboratory bench research ECU and exhaust ECU simulation output, to meet the requirements of various aspects of teaching, through the CAN bus interface After receiving the return signal, the actual speed of the ECU is known, and the test result is accurate.
Technology developer: hidden
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Document number: +8618813675677
detailed description:
The signal simulator of the present invention is a portable host as a whole, which is generally rectangular in structure, and has the advantage of being easy to carry and use. The portable host is also provided with a serial port interface for communication with the PC. In order to ensure stable signal output, the MCU main controller 8 is connected to the ECU signal output serial port through an isolated output circuit.
The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Technical characteristics:
1. An automobile emission ECU signal simulator, characterized by comprising a portable host, an output interface on the portable host for outputting digital signals to the emission ECU, a three-way catalyst and an oxygen sensor voltage output to the automobile ECU Analog signal output interface, and CAN bus interface for outputting analog speed value and frame number information to the exhaust ECU and receiving the returned speed value. The portable host is provided with an MCU main controller. The MCU main controller is respectively connected to an expansion unit, a power signal output interface, an analog torque signal output interface and a CAN bus interface. The MCU main controller is also provided with a serial port module and a power module. And external connection module.
2. An automobile ECU signal simulator according to claim, wherein the portable host is further provided with a serial port interface for communication with a PC, and the MCU main controller is connected to the serial port interface.
3. An automobile steering ECU signal simulator according to claim, wherein the MCU main controller is connected to the ECU signal output interface through an isolated output circuit.
Technical summary:
The utility model discloses an emission ECU signal simulator of an automobile test bench, which includes a portable host and a portable host. The utility model is a portable device, which is flexible and convenient to use. It can simulate and output corresponding signals for the emission ECU and the attack ECU to meet various teaching requirements. Through the CAN bus interface, it can receive the return signal and return the actual speed and frame number of the ECU. The test result is accurate.
