Electric heater plug control system with self-adaptive power supply voltage

Abstract

The invention provides an electric heater plug control system with self-adaptive power supply voltage. The electric heater plug control system comprises an electric heater plug, a power supply voltageacquisition module, a CPU central processor, an electrical level conversion module, a power drive module, an MOSFET power tube, a sampling resistor and a current sampling module, wherein the CPU central processor adopts a PID algorithm to control the system according to the following processing steps: (1) calculating current working power of the electric heater plug according to a voltage signalacquired by the power supply voltage acquisition module and a current signal acquired by the current sampling module; 2) comparing the calculated current working power of the electric heater plug withrated power of the electric heater plug, calculating a deviation value, taking the deviation value as input of the PID control algorithm, and outputting a PWM pulse-width modulation signal as controlamount by a PCA module according to the calculated results of the PID control algorithm. According to the electric heater plug control system, the electric heater plug can automatically adapt to changes of power supply voltage of the whole vehicle, and ignition requirements can be met at an engine starting working condition and an operating working condition, so that adaption of the power supplycontrolled by the electric heater plug is improved.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, and in particular relates to a power supply voltage self-adaptive glow plug control system. Background technique [0002] Diesel engines with high power and low compression ratio are difficult to start in low temperature environments, and pistons are ablated due to insufficient combustion during operation. To solve these problems, diesel engines are usually equipped with flame intake preheating devices. The main implementation of preheating devices Component glow plugs, the existing design uses relays to control them. [0003] This control method has two disadvantages: 1. The requirements for the power supply of the whole vehicle are relatively high, and the power supply voltage must maintain the rated power supply voltage of the glow plug to ensure that the glow plug can work at the rated power to meet the ignition requirements and not be burned at the same time. According to GJBXXX, the...

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Problems solved by technology

[0002] Diesel engines with high power and low compression ratio are difficult to start in low temperature environments, and pistons are ablated due to insufficient combustion during operation. To solve these problems, diesel engines are usually equipped with flame intake preheating devices. The main implementation of preheating devices Component glow plugs, which are controlled by relays in existing designs

[0003] This control method has two disadvantages: 1. The power supply requirements for the whole vehicle are relatively high, and the power supply voltage must maintain the rated power supply voltage of the glow plug to ensure that the glow plug can work at the rated power and meet the ignition requirements without being burned.

According to GJBXXX, the diesel engine power supply system, during the starting period, the voltage can be reduced to 16V at least, and it will be restored to 28V after starting, so if the rated voltage of the glow plug meets the voltage after starting, it will not work normally under the voltage of 16V during the starting period; Starting voltage, the engine is easy to be burned after starting

2. Long-term use of the relay is prone to contact adhesion failure, resulting in the failure of the preheating device to control the glow plug, or even burning the glow plug

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