High-precision torque control method for hybrid power diesel engine

Abstract

The invention discloses a high-precision torque control method for a hybrid power diesel engine. The high-precision torque control method is characterized by comprising the following steps of: acquiring an indication torque, and calibrating to obtain an initial value of oil injection quantity; limiting the initial value of oil injection quantity based on a maximum limit value of accelerated smokeintensity and atmospheric density to obtain a limit value of oil injection quantity; and correcting the fuel injection quantity according to the combustion efficiency and the intercooled temperature to obtain a fuel injection quantity correction value, and controlling the actual fuel injection quantity of the engine to be the fuel injection quantity correction value. Accessory work is added when the indication torque is determined, the accessory work is corrected based on the water temperature of the engine, and the indication torque is more accurate. The fuel injection quantity correction value is obtained by comprehensively considering the influence of various factors, so that under the actual fuel injection quantity, the error between the actually measured flywheel end output torque andthe bus net torque can be reduced, and the torque control precision is improved.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to a high-precision torque control method for a hybrid diesel engine. Background technique [0002] Usually, diesel engines follow the SAE J1939 protocol to transmit torque information by sending and receiving messages through the bus, and obtain the corresponding torque through combustion control for the torque demand of the system, and then send various torques to the bus through messages, so as to achieve the target demand Torque control is usually used for functional requirements such as engine torque limit and vehicle gear shifting. [0003] Since traditional diesel engines are mostly matched with manual transmission models, the requirements for bus torque accuracy are not high, and the torque chain is usually relatively simple. For a hybrid diesel engine, when the flywheel motor is involved in power generation, the torque chain of the power system will change greatly. ...

AI Technical Summary

Problems solved by technology

In particular, models matched with AT automatic transmissions have high requirements on torque accuracy, so it is necessary to avoid excessive differences between actual torque and bus torque, resulting in insufficient torque control accuracy, failure to achieve functional purposes such as torque limit, and impact on transmission shifting etc. However, traditional torque chain control strategies usually cannot meet this requirement

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