Ignition system from an internal combustion engine专利检索-施密特触发器电子零件及设备专利检索查询-专利查询网

Ignition system from an internal combustion engine

阅读：185发布：2022-01-15

专利汇可以提供Ignition system from an internal combustion engine专利检索，专利查询，专利分析的服务。并且An ignition system regulates the ignition timing of a combustion engine by first generating a series of pulses in synchronism with the position of the rotating crankshaft which are utilized to trigger a monostable multivibrator to generate a series of uniform pulses. The average value of these uniform pulses is obtained by passing these through low pass filters and utilized to drive a constant DC current source which charges a storage capacitor to form part of a saw-tooth generator. The resulting slopes of the leading edges thus formed are a function of the crankshaft rotation speed. An independent set of impulses, also synchronously timed with the position of rotation of the crankshaft, is used to discharge the storage capacitor. The sawtooth wave-form is applied to a Schmidt-trigger which is adjusted to sense a predetermined level of the leading edges. When the leading edge reaches this threshold value, the Schmidt-trigger activates an amplifier which transmits a control signal to the ignition coil of the combustion engine to ignite the combustible mixture in the cylinders. By regulating the level of the sawtooth wave-form as a function of the rotational speed of the crankshaft and the intake manifold pressure, the ignition timing can be regulated in response to changes in these parameters.，下面是Ignition system from an internal combustion engine专利的具体信息内容。

权利要求

1. In an ignition system for an internal combustion engine having a crankshaft, ignition timing arrangement comprising generating means comprising a saw-tooth generator for generating saw-tooth pulses having leading edges, the slope of said leading edges and the frequency of said pulses being a function of engine speed, with said leading edges fluctuating between first and second levels, said saw-tooth generator comprising a storage capacitor, constant current means for slowly charging said storage capacitor, switching means for rapidly discharging said capacitor, electrical impulse generator means for generating pulses in synchronism with the position of said crankshaft, monostable miltivibrator means for generating uniform pulses in response to the generation of said impulses by said impulse generator means, first and second low-pass filters, said first low pass filter having a lower cut-off frequency than said second low-pass filter, the inputs to said filters being connected to said multivibrator means for receiving said uniform pulses, and the outputs of said low-pass filters being connected to said constant current means for regulating the magnitude of said constant current, and equalizing means connected between the respective outputs of said first and second low-pass filters for equalizing the levels of the voltages at the corresponding outputs of the latter; and detecting means for detecting the magnitude of said leading edges and generating an ignition signal when the magnitude of the leading edges of said pulses reaches a predetermined level.

2. In an ignition system as defined in claim 1, wherein said generating means further comprises an impedance transFormer provided between said first low pass filter and said constant current means.

3. In an ignition system as defined in claim 2, wherein said generating means further comprises an inverting amplifier provided between said low pass filters and said saw-tooth generator, said inverting amplifier having first and second outputs, the DC voltage level at said first output increasing with increasing speed, the DC voltage level at said second output decreasing with increasing speed, said saw-tooth generator being connected to said first output.

4. In an ignition system as defined in claim 3, wherein said detecting means comprising a threshold circuit arranged to detect said predetermined level; a summing device having a plurality of inputs and at least one output, said one output being connected to said threshold circuit, and one input being connected to said saw-tooth generator.

5. In an ignition system as defined in claim 4, wherein another input of said summing device is connected to said second output of said inverting amplifier.

6. In an ignition system as defined in claim 5, said detecting means further comprising an impedance transformer provided between said saw-tooth generator and said summing device.

7. In an ignition system as defined in claim 5, said detecting means further comprising a limiting stage provided between said second output of said inverting amplifier and said other summing device input.

8. In an ignition system as defined in claim 3, wherein said detecting means further comprises a pressure transducer means for sensing the intake manifold pressure, said latter means being connected to a third input of said summing device.

9. In an ignition system as defined in claim 8, wherein said detecting means further comprises a limiting stage provided between said pressure transducer means and said summing device.

10. In an ignition system as defined in claim 8, wherein said pressure transducer means comprises an oscillator having inductive feedback coupling; and a damping element mechanically actuated by the position of the engine throttle for modifying said coupling.

11. In an ignition system as defined in claim 10, wherein said oscillator is in the audion circuit configuration.

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Ignition system from an internal combustion engine

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