A laboratory model for an direct injection system was designed for the
metering of appropriate herbicide into a carrier close to the nozzles. Two experiments
were performed to investigate the dynamic behavior of this system. In the first
experiment the position of the injection point was the center of a boom section and in the
second experiment the chemical ingredient was injected close the nozzle. For these
experiments a laboratory model of an injection sprayer system was employed. The
concentration of metered chemical ingredient was measured down-stream of the
injection point using a conductivity sensor based on sensing the electrical conductivity of
a salt solution. This sensor was developed for the evaluation of the system time response
characteristic of the sprayer.
The direct nozzle injection assembly provided a minimal response time from
injection point to nozzle tip with less than 2.8 s. The injection applied to a boom section
caused response time with a maximum of 7.5 s. This implies a maximum position error
of 6.8 to 16.7 m at 8 km h-1 forward speed of the sprayer with camera system for weed
detection.Labaratorijski model dirketnog injektorskog sistema je razvijen u smislu
odgovarajuće aplikacije herbicida u blizini radnog rasprkivača. Dva eksperimenta su
izvedena u cilju istraživanja dinamike ovog sistema. U prvom, pozicija injekcione tačke
je bila centar krila prskalice a u drugom hemikalija je injektirana u blizini rasprskivača.
U svrhu ovog eksperimenta, labaratorisjki model injektorskog uređaja je upotrebljen.
Koncentracija aktivne supstance je merena ispod struje injekcione tačke upotrebom
konduktivnog senzora baziranog na električnoj provodljivosti slanog rastvora. Ovaj
senzora je razvijen za procenu vremena odgovora sistema prskalice.
Uređaj za direktno injektiranje pokazuje minimalno vreme reakcije od injekcione
tačke do vrha rasprskivača, manje od 2.8 s. Injektiranje primenjeno na sekcijama krila
pokazalo je reaktivno vreme maksimalno do 7.5 s. Ovo implicira maksimalnu pozicionu
grešku od 6.8 do 16.7 m pri 8 km/h brzine prskalice sa detekcionim sistemom korova
snimanjem kamerom