A system and method for collecting speed signal of internal combustion engine

Abstract

The present invention provides a system and method for collecting speed signals of internal combustion engines, including: a plurality of ECUs; the first-level ECU collects magnetoelectric speed signals, converts the collected magnetoelectric speed signals into Hall speed signals and sends them to its own MCU, Simultaneously send to the adjacent second-level ECU; the second-level ECU sends the Hall speed signal to its own MCU, and simultaneously sends it to the adjacent third-level ECU; the third-level ECU and so on. The magnetoelectric speed signal is converted into the Hall speed signal inside the ECU, which saves the cost of additional development of a dedicated speed processing circuit. The number of ECUs that can be connected is not limited by the pins of the dedicated speed processing circuit. Without considering the signal transmission delay, there are countless ECUs receiving the speed signal at the same time, ensuring that multiple ECUs simultaneously calculate the fuel injection time. sex.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine control, in particular to a system and method for collecting rotational speed signals of an internal combustion engine. Background technique [0002] In electronically controlled engine control, the speed signal is the most important input signal, because all the important functions of the engine are realized based on the accurate speed signal. For example, by collecting the engine speed signal to control the injection timing with high precision. [0003] At present, in high-power multi-cylinder high-pressure common rail electronically controlled internal combustion engines, especially in internal combustion engines with more than six cylinders, such as large power generation equipment and ships, more than one ECU is required, and at least two ECUs are often required to control multiple cylinders. Complete injection control. In this way, each ECU needs to collect the speed sig...

AI Technical Summary

Problems solved by technology

[0009] However, this method has relatively high requirements on the rotational speed processing circuit 100, resulting in relatively high development costs for the entire vehicle controller. Since the rotational speed processing circuit 100 is a circuit independent of the ECU, it is necessary to separately equip the housing wire harness and the like, and Reliability needs to be verified, and the life of the speed processing circuit 100 cannot be guaranteed to be consistent with that of the ECU

Therefore, using a dedicated controller greatly increases the cost of the entire system, and is limited by the number of pins of the dedicated controller, so it cannot expand countless ECUs, and the flexibility is low

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