Method and system for estimating output voltage of ignition coil

Abstract

The invention discloses a method for estimating an output voltage of an ignition coil. In the method, the maximum output voltage of the ignition coil at each effective engine rotating speed is compared with a mixed gas limiting breakdown voltage and at each effective engine rotating speed, if the difference obtained by subtracting the mixed gas limiting breakdown voltage from the maximum output voltage of the ignition coil is greater than a set voltage, the output voltage of the ignition coil meets the requirement of an engine ignition system, wherein at one engine rotating speed, if an ignition current in the igniting process under the maximum ignition voltage of the ignition coil is reversed, the engine rotating speed and the maximum ignition voltage of the ignition coil at a corresponding point are eliminated as invalid values; and the maximum ignition voltage of the ignition coil at each engine rotating speed, which is subjected to elimination of the invalid values, is used as the mixed gas limiting breakdown voltage at each effective engine rotating speed. The invention also discloses a system for estimating the output voltage of the ignition coil. According to the invention, the output voltage of the ignition coil can be accurately estimated.

Description

technical field [0001] The invention relates to automotive electronic technology, in particular to a method and system for evaluating the output voltage of an ignition coil. Background technique [0002] The ignition coil is one of the core components of the gasoline engine's fire circuit system, and its performance directly determines whether the engine can be ignited reliably. For the ignition coil, two parameters are particularly critical, one is the output voltage of the ignition coil, which directly determines whether the mixture can be effectively broken down, and the other is the output energy of the ignition coil, which directly determines whether the spark lasts long enough Long; in the state of lean combustion, due to the weak chemical energy, a sufficiently long spark duration can fully heat the mixed gas around it, increase the temperature of the mixed gas, help the release of chemical energy, and reduce the misfire rate; but for the current domestic market For ...

AI Technical Summary

Problems solved by technology

[0014] In the existing ignition coil output voltage evaluation method, when the ignition coil ignition voltage maximum value is collected at one speed during the ignition process, the engine misfire will occur. The misfire may be caused by the mixture not being broken down. It may be caused by the airflow disturbance and collapsing during the diffusion process of the fire nucleus. If the maximum ignition voltage of the ignition coil during the ignition process collected at this speed happens to correspond to the situation where the mixture is not broken down, then the collected speed The maximum value of the ignition coil ignition voltage during the ignition process is the wrong limit breakdown voltage value of the mixture at this speed, so the collected maximum value of the ignition coil ignition voltage during the ignition process at this speed is directly used as the speed It is difficult to accurately evaluate the output voltage of the ignition coil if the ultimate breakdown voltage value of the mixture is lowered and the subsequent statistical analysis is performed.

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