Boots – shoes – and leggings
Patent
1989-11-28
1991-06-11
Lall, Parshotam S.
Boots, shoes, and leggings
36443105, 36443112, 123486, 123489, 123416, G06F 1548, G06G 770, F02M 5100, F02P 500
Patent
active
050237942
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a learning control method having precontrol for an operating variable of an internal combustion engine wherein the operating variable is to be adjusted. The operating variable to be adjusted can, for example, be the fuel metering time duration, the ignition time point, the charging pressure, the exhaust gas feedback rate or even the idle speed. The invention furthermore relates to an apparatus for carrying out such a method.
BACKGROUND OF THE INVENTION
Such a method and the apparatus corresponding thereto are known from U.S. Pat. No. 4,827,937. The apparatus has precontrol means, desired value generating means, control means, attenuating means, learning condition recognition means and a learning characteristic field. The precontrol means supplies a precontrol value for the operating variable to be adjusted in dependence upon values of other operating variables than that which is to be adjusted. The desired value generating means supplies a control variable desired value which is compared to a particular control variable actual value. The control means forms an output value in dependence upon the difference between the two mentioned values by means of which the particular precontrol value is corrected in a controlled manner. The precontrol value is however also corrected in a controlled manner with the aid of an adaptation value read out of the learning characteristic field. The learning characteristic field stores adaptation values addressable via values of the address operating variables. For correcting the precontrol values, the learning characteristic field reads out that adaptation value which belongs to the available data record of values of the address operating variables. The adaptation values are always newly determined and always then when the learn condition recognition means issues a learn signal for a particular adaptation value when a predetermined learn condition is fulfilled. The correction occurs with the aid of the output value supplied with the aid of the control means and which is not directly applied for the correction; instead, only after multiplication with a learn intensity factor delivered by the attenuation means.
A learn characteristic field whose support point values are changed with the aid of attenuated values of an actuating variable at the entry of a learn condition is disclosed also in the SAE paper No. 860594, 1986, for an arrangement for adjusting the injection time. With this apparatus, the attenuation means does not continuously give out the same learn intensity value; instead, this value is dependent upon how often learning has taken place at a support point and how large the particular actuating variable is. In order to supply the variable learning intensity values which are factors, the attenuation means includes a counter reading memory and a learn intensity table. In the counter reading memory, a counter reading is stored for each support point of the characteristic field with the support points being identical with those of the learn characteristic field. The reading is increased by 1 up to a 16-bit value with each new learn cycle for each affected support point. However, if the output value for this support point is greater than a threshold value in three sequential learn cycles, the counter reading is reset to 0 for this support point. A learn intensity factor is read out from the learn intensity table in dependence upon the particular counter reading and in dependence upon the particular value of the actuating variable with the learn intensity factor being fixedly predetermined for these address values. The actuating variable is multiplied by this learn intensity factor and the result is added to the previously available support point value.
It has been shown that the system tends to relatively few oscillations when working with a single learn intensity value. The precondition applies however that the value is not set too high. Otherwise, the problem is present that the learning cannot take place with adequate
REFERENCES:
patent: 4552115 (1985-11-01), Okino
patent: 4715344 (1987-12-01), Tomisawa
patent: 4768490 (1988-09-01), Heck et al.
patent: 4879656 (1989-11-01), Quigley et al.
patent: 4932376 (1990-06-01), Linder et al.
SAE Paper #860594, "Development of a High-Speed High-Precision Learning Control System for the Engine Control", Tomisawa et al.
Lall Parshotam S.
Ottesen Walter
Pipala E. J.
Robert & Bosch GmbH
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