Over-temperature protection control method of engine vortex front closed-loop temperature

Abstract

The invention discloses a closed-loop temperature over-temperature protection control method before the vortex of the engine, comprising step 1: setting T_Max, T_RlsOn and T_RlsOff in the vehicle electronic control unit, and detecting T_RlsOff in real time through a monitoring sensor 3 and sent to the vehicle electronic control unit; step 2: the vehicle electronic control unit judges T 3 Whether it is greater than the activation temperature value T_RlsOn, if not, do not activate the closed-loop control function, and return to step 1; if yes, perform step 3; step 3: the vehicle electronic control unit activates the closed-loop control function, limits engine performance, and makes T 3 ≤T_Max; Step 4: Vehicle electronic control unit judges T 3 Whether it is greater than the control T_RlsOff, if so, return to step 3 and continue the closed-loop control, if not, this closed-loop control function ends. The invention can self-adjust through real-time temperature changes, so that the performance of the engine can be optimized in various vehicle application environments, and the control is more precise.

Description

technical field [0001] The invention relates to the field of calibration and matching of high-pressure common rail diesel engines, in particular to a method for over-temperature protection and control of closed-loop temperature before the vortex of the engine. Background technique [0002] The currently widely used control strategy for vortex front temperature protection is mainly open-loop control. Although this control method can play a good role in temperature protection, the biggest defect is that it restricts the performance of the engine too strictly and needs to be controlled at a lower temperature. The temperature starts to limit the torque. The general experience is to ensure that the actual temperature and the boundary limit have an 8%-10% margin, that is, the temperature is at least 30ºC away from the limit, otherwise there is a risk of over-temperature damage to the engine components, and the control accuracy is low; Therefore, the open-loop control method cannot...

AI Technical Summary

Problems solved by technology

[0002] The currently widely used control strategy for vortex front temperature protection is mainly open-loop control. Although this control method can play a good role in temperature protection, the biggest defect is that it restricts the performance of the engine too strictly and needs to be controlled at a lower temperature. The temperature starts to limit the torque. The general experience is to ensure that the actual temperature and the boundary limit have an 8%-10% margin, that is, the temperature is at least 30ºC away from the limit, otherwise there is a risk of over-temperature damage to the engine components, and the control accuracy is low; Therefore, the open-loop control method cannot guarantee accurate identification of the actual exhaust temperature performance, that is, the protection function will be activated when the whole vehicle runs to the specified working condition area, and it does not depend on the actual temperature performance. Problems and risks of incorrectly activating protection features

One reason for this is that the dispersion between vehicles and the different temperature behavior under various boundary conditions are difficult to correct with open-loop control, and the other reason is that the control method is not suitable for precise temperature control

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