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Ignition coil primary inductance measurement method and measurement system thereof

A technology of ignition coil and primary inductance, which is applied in the direction of inductance measurement, measurement of electrical variables, and measurement devices, can solve the problem of ignition coil primary inductance error and other problems, and achieve the effect of preventing measurement error

Pending Publication Date: 2018-04-17
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for measuring the primary inductance of the ignition coil and its measurement system, so as to solve the problem of errors caused by the static measurement of the primary inductance of the ignition coil as the current changes

Method used

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  • Ignition coil primary inductance measurement method and measurement system thereof
  • Ignition coil primary inductance measurement method and measurement system thereof
  • Ignition coil primary inductance measurement method and measurement system thereof

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Experimental program
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Effect test

Embodiment 1

[0045] Basic principle of on-line measurement of dynamic equivalent inductance of primary winding of ignition coil: energy conservation. Combined with the working process of the ignition coil, during the charging process of the ignition coil, the power supply charges the ignition coil, and the energy is stored in the ignition coil, until the drive stage switch is turned off, the energy stored in the ignition coil is then discharged to the spark plug through the secondary coil . During the charging process, the energy W supplied by the power supply to the primary winding of the ignition coil in Equal to the energy W stored in the ignition coil L and the energy dissipated in the circuit W R the sum of

[0046] W in =W L +W R ……(1)

[0047] The energy W stored in the charging process of the equivalent inductance L L Calculated by formula (2):

[0048]

[0049] In the formula, I is the current in the primary winding of the ignition coil; L is the primary inductance of th...

Embodiment 2

[0075] refer to Figure 5 , which shows the principle schematic diagram of the fire coil dynamic equivalent primary inductance on-line measurement circuit of the second embodiment; on the basis of the first embodiment, the information collection process is simplified, the amount of data collected and calculated is reduced, and it is easier in engineering applications accomplish.

[0076] Specifically, reduce the voltage on U c The acquisition is replaced by the approximate voltage difference ΔV, then the inductor voltage is calculated as an approximate value: U L =U b -ΔV. ΔV selects an intermediate value through a compromise between statistical measurement and calculation, taking into account charging time, energy calculation and component protection.

Embodiment 3

[0078] refer to Image 6 , which shows the principle schematic diagram of the fire coil dynamic equivalent primary inductance online measurement circuit of the third embodiment; it can be seen from the figure that the symbols of the drive stage switches are different, and the specific difference from the embodiment is that the ignition coil primary current detection and It can be implemented by selecting an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) with a current sensing pin. Through the current sensing pin of the IGBT, a current detection resistor with a relatively large resistance value (commonly used in ECU, the role of current detection here) is also used to detect the current, which has no effect on the main current path and reduces heat. Consumption, the acquisition of the primary current of the ignition coil can also be realized.

[0079] In summary, the method for measuring the primary inductance of the ignition coil and its measureme...

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PUM

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Abstract

The invention provides an ignition coil primary inductance measurement method and measurement system thereof. Firstly an ignition coil measurement circuit is provided and the measurement circuit is controlled to be closed; the electric quantity parameters of the measurement circuit of the ignition coil are acquired and the primary inductance of the ignition coil is calculated according to the electric quantity parameters by using the law of conservation of energy; and the corresponding measurement system is obtained according to the measurement method. According to the ignition coil primary inductance measurement method and measurement system thereof, the dynamic equivalent inductance of the primary winding of the ignition coil can be acquired so that the measurement error of the primary inductance of the ignition coil caused by the change of the current can be effectively prevented and the primary inductance is more accurate in comparison with the primary inductance measured by directly using the tester under the offline state; furthermore, the dynamic equivalent inductance of each ignition coil installed on the engine changing along with the current change under different temperature can be acquired so that the relevant parameters required for ignition control can be accurately calculated.

Description

technical field [0001] The invention relates to the field of engine ignition coils, in particular to a method for measuring the primary inductance of an ignition coil and a measurement system thereof. Background technique [0002] With the vigorous development of the automobile industry, the increase of vehicle comprehensive cost and emission-related environmental protection have received more and more attention. The automotive industry is accelerating research into new powertrains to reduce fuel consumption, increase power density and enhance vehicle robustness. As an important part of the vehicle power system, the ignition system makes a significant contribution to the improvement of system efficiency, the reduction of emission pollution and the increase of robustness. [0003] Coil ignition is currently the main ignition form of gasoline engines, natural gas engines, hydrogen engines and other fuel engines. The ignition control of the coil ignition system is controlled ...

Claims

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Application Information

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IPC IPC(8): G01R27/26
CPCG01R27/2611
Inventor 鲜志刚宋佳敏曹银波
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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