A control method for an n-speed start-stop system

Abstract

The invention discloses a control method implemented by an N-gear start-stop system. The control method includes firstly, enabling an engine in a running state to enter an N-gear flameout state under conditions that A, the speed of a vehicle is lower than a threshold value Vf, A1, the rotation speed of the engine is higher than a threshold value Fs1, B, the vehicle is in a brake state, B1, the boosting vacuum degree of a brake system is higher than a threshold value Zf, C, voltage of a storage battery is higher than a threshold value Uf, D, the temperature of water of the engine is higher than a threshold value Ff, and E, an N gear of a transmission is activated and the retention time of the N gear of the transmission is longer than a threshold value Tf after the engine is ignited and started by the aid of a key switch; and secondly, enabling the N-gear start-stop system to transmit 'start instructions' to a starter and the engine until the engine reenters a start state when the engine is ignited and started by the aid of the key switch and start conditions of the engine are met. The control method has the advantages that the fuel economy can be effectively improved, the exhaust emission is reduced, the production cost is low, and the control method is suitable for popularization and application.

Description

technical field [0001] The invention relates to the field of automobile control, in particular to a control method of an N-gear start-stop system developed based on an automatic transmission. Background technique [0002] With the continuous improvement of fuel prices, fuel consumption speed, and the increasing air pollution caused by automobile exhaust emissions, the society has stricter requirements on automobile fuel consumption performance; Various technologies have received much attention. With the continuous application of new technologies, the performance of the engine is also becoming more and more mature; it is difficult to make a major breakthrough in the control of fuel economy and exhaust emissions from the improvement of engine performance alone; therefore, the concept of engine idling start-stop is applied. in the vehicle control system. Engine start-stop means that when the car is idling and the speed is lower than a certain value, the engine is turned off; ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the inconvenient use of the existing engine brake start-stop start-stop system when it is applied in a single-power vehicle, the fuel-saving effect is not obvious, the production cost is high, the development cycle is long, and it is not suitable for popular applications. The problem is to provide a control method for the N gear start-stop system that is not only convenient to use, flexible and reliable, but also can effectively improve fuel economy and reduce exhaust emissions; and has low production cost and short development cycle, and is suitable for popular applications.

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