Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1986-11-21
1988-08-09
Wolfe, Jr., Willis R.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
123478, F02M 2506
Patent
active
047621095
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a device or a method for influencing control of operational magnitudes of internal combustion engines having exhaust gas recirculation.
In order to lower the impact on the environment due to the emission of harmful substances from internal combustion engines, a number of measures are available for reducing these harmful substance emissions. All these measures are directed to obtain an optimum exhaust gas quality with smallest changes of serviceability like, for example, fuel consumption, drive capacity, drive characteristic and price. Apart from other methods, in particular the exhaust gas return had been shown to be reliable for reduding the harmful substance emission. Thereby, a portion of the exhaust gases is returned from the exhaust to the intake, whereby the returned amount of exhaust gas is regulated by pneumatic or electrically controlled exhaust gas return valves. As a result of this measure the temperature and the peak pressures are reduced in the combustion chamber and thereby a reduced emission in particular of nitric oxides is achieved.
For example, for the fuel feeding in an internal combustion engine with exhaust gas return a control device is known which is provided with an intake or suction pressure measuring transmitter or sensor for measuring the intake underpressure, a differential pressure-measuring transmitter or sensor for measuring the pressure differential of the pressures in the exhaust gas return conduit and in the intake pipe, a rotary speed meter for picking up the rotary speed of the motor and a device for determining the required amount of fuel which is fed to the motor in dependency on these three measuring magnitudes.
It has been shown to be disadvantageous in this known control device that in addition to the conventional load sensor, which is designed as a pressure sensor, a further sensor must be used for picking up the amount of the returned exhaust gas. This very expensive additional sensor, which is designed as a differential pressure senor, requires additional constructive adjustments on the exhaust gas return pipe, so that its operability be assured.
ADVANTAGES OF THE INVENTION
In contrast thereto, the inventive device for the inventive method of affecting operational magnitudes of internal combustion engines is advantageous in that only a single pressure sensor is used. Such a pressure sensor is anyway provided in pressure-rotary-speed-controlled systems, so that the constructive and mechanical expenditures for installing an exhaust gas return system are reduced to a minimum.
A further advantage when using only a single pressure sensor results from the reduced susceptibility to breakdown of the system.
A very flexible data analysis is made possible by the use of only a single pressure sensor in combination with a control device, wherein the measuring values are further processed. Thereby an uncomplicated adaptation, high reliability and accuracy is assured for different types of internal combustion engines.
Further advantages of the invention are the result of the embodiments of the invention stated in the subclaims. Due to the timely successive measuring of at least two pressure values, in particular during switched on and switched off exhaust gas return the further processing of the measuring signals is simplified, on the one hand, and a control function with respect to the operability of the pressure sensor is exerted, on the other hand.
The averaging of a plurality of pairs of measuring values has to be considered to be very advantageous, because in this manner possible errors caused by dynamic processes can be eliminated. A further advantage is obtained by introducing an adaptive adjustment of the control values responsible for the amount of the return exhaust gas in dependency on operational parameters of the engine. Thus, long time drifting due to aging and contamination, for example, of the exhaust gas return valve, is corrected.
These advantages and further special features or advantageous further embodiments a
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Robert & Bosch GmbH
Striker Michael J.
Wolfe, Jr. Willis R.
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