3 research outputs found
ΠΠ± ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΈΠ» ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ ΠΊΠΎΠ»Π΅Ρ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°, ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ
The paper considers a method for calculation and evaluation of an automated brake proportioning system and it also describes assessment of efficiency while using cohesion forces of an automated system during vehicle braking process (MAZ 256200 taken as an example). A method for efficiency estimation of the vehicle braking equipped with an automated brake proportioning system is graphically presented in the paper. A comparable analysis has been made in order to evaluate vehicle braking efficiency in three various conditions of its wheel motion during braking process. The paper contains description of braking processes for a vehicle at its idealized braking, at braking with an operating automated system and at braking with blocked wheels. Mathematical dependences have been proposed and they make it possible to calculate a coefficient of cohesion forces used by an automated brake proportioning system on the basis of time parameters for vehicle braking process. The proposed mathematical dependences take into account design peculiarities of the automated system, i.e. a diagram of modulator arrangement on axes of the vehicle. The executed analysis for calculation accuracy of the coefficient pertaining to use of cohesion forces of the automated system with and without taking into accout rolling force resistance of the vehicle wheels has demonstrated a possibility to apply the proposed calculation methods for carrying out auto-technical expertise while investigating road-traffic accidents involving transport facilities equipped with such systems as ABS. The paper proposes a dependence for identification of a vehicle braking distance on the basis of the coefficient on use of cohesion forces by the automated brake proportioning system. The executed experimental investigations on both test and serial models of the automated brake proportioning system have allowed to justify theoretical discussions concerning application of tyre-road adhesion in the operational process of the vehicle brake proportioning system. The investigation results have shown high efficiency of the test automated brake proportioning system developed by Chair of Automobiles in the name of A. B. Hredescul at Kharkiv National Automobile and Road University under the following braking conditions: dry road surface and compacted snow cover.Π ΡΡΠ°ΡΡΠ΅ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½ ΠΌΠ΅ΡΠΎΠ΄ ΡΠ°ΡΡΠ΅ΡΠ° ΠΈ ΠΎΡΠ΅Π½ΠΊΠΈ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ, Π° ΡΠ°ΠΊΠΆΠ΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΎΡΠ΅Π½ΠΊΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠ»Ρ ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΡ ΠΊΠΎΠ»Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π° (Π½Π° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ Π°Π²ΡΠΎΠ±ΡΡΠ° ΠΠΠ 256200). ΠΡΠ°ΡΠΈΡΠ΅ΡΠΊΠΈ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ ΠΈ ΠΎΠ±ΠΎΡΠ½ΠΎΠ²Π°Π½ ΡΠΏΠΎΡΠΎΠ± ΠΎΡΠ΅Π½ΠΊΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°, ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π° Π² ΡΡΠ΅Ρ
ΡΠ°Π·Π½ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π΅Π³ΠΎ ΠΊΠΎΠ»Π΅Ρ ΠΏΡΠΈ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΠΈ. ΠΠΏΠΈΡΠ°Π½Ρ ΠΏΡΠΎΡΠ΅ΡΡΡ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΡ ΠΏΡΠΈ ΠΈΠ΄Π΅Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΌ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΠΈ, ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΠΈ ΠΏΡΠΈ ΡΠ°Π±ΠΎΡΠ΅ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠΈ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΠΈ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π° Ρ Π·Π°Π±Π»ΠΎΠΊΠΈΡΠΎΠ²Π°Π½Π½ΡΠΌΠΈ ΠΊΠΎΠ»Π΅ΡΠ°ΠΌΠΈ. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Ρ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠΈΠ΅ ΡΠ°ΡΡΡΠΈΡΠ°ΡΡ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠ»Ρ ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΠΏΡΠΎΡΠ΅ΡΡΠ° ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΡΠ΅ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΡΡΠΈΡΡΠ²Π°ΡΡ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ, Ρ. Π΅. ΡΡ
Π΅ΠΌΡ ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΡ ΠΌΠΎΠ΄ΡΠ»ΡΡΠΎΡΠΎΠ² Π½Π° ΠΎΡΡΡ
ΠΊΠΎΠ»Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°. ΠΡΠΏΠΎΠ»Π½Π΅Π½Π½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΡΠΎΡΠ½ΠΎΡΡΠΈ ΡΠ°ΡΡΠ΅ΡΠΎΠ² ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠ»Ρ ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ Ρ ΡΡΠ΅ΡΠΎΠΌ ΠΈ Π±Π΅Π· ΡΡΠ΅ΡΠ° ΡΠΈΠ» ΡΠΎΠΏΡΠΎΡΠΈΠ²Π»Π΅Π½ΠΈΡ ΠΊΠ°ΡΠ΅Π½ΠΈΡ ΠΊΠΎΠ»Π΅Ρ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π° ΠΏΠΎΠΊΠ°Π·Π°Π» Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΡΠ°ΡΡΠ΅ΡΠ° Π² ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ Π°Π²ΡΠΎΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΊΡΠΏΠ΅ΡΡΠΈΠ· ΠΏΡΠΈ ΡΠ°ΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ Π΄ΠΎΡΠΎΠΆΠ½ΠΎ-ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΡΡ
ΠΏΡΠΎΠΈΡΡΠ΅ΡΡΠ²ΠΈΠΉ Ρ ΡΡΠ°ΡΡΠΈΠ΅ΠΌ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΡΡ
ΡΡΠ΅Π΄ΡΡΠ², ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½Π½ΡΡ
ΡΠ°ΠΊΠΈΠΌΠΈ ΡΠΈΡΡΠ΅ΠΌΠ°ΠΌΠΈ, ΠΊΠ°ΠΊ ABS. ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΠΏΡΡΠΈ ΠΊΠΎΠ»Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠ»Ρ ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ. ΠΡΠΏΠΎΠ»Π½Π΅Π½Π½ΡΠ΅ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΠΏΡΡΠ½ΠΎΠ³ΠΎ ΠΈ ΡΠ΅ΡΠΈΠΉΠ½ΠΎΠ³ΠΎ ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΠ»ΠΈ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠ΄ΠΈΡΡ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ°ΡΡΡΠΆΠ΄Π΅Π½ΠΈΡ Π² ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΡΠΈΠ» ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΡΠ°Π±ΠΎΡΡ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ ΠΊΠΎΠ»Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΏΠΎΠΊΠ°Π·Π°Π»ΠΈ Π²ΡΡΠΎΠΊΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΡΠ°Π±ΠΎΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠΉ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ, ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠΉ Π½Π° ΠΊΠ°ΡΠ΅Π΄ΡΠ΅ Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Π΅ΠΉ ΠΈΠΌΠ΅Π½ΠΈ Π. Π. ΠΡΠ΅Π΄Π΅ΡΠΊΡΠ»Π° Π₯Π°ΡΡΠΊΠΎΠ²ΡΠΊΠΎΠ³ΠΎ Π½Π°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»ΡΠ½ΠΎΠ΄ΠΎΡΠΎΠΆΠ½ΠΎΠ³ΠΎ ΡΠ½ΠΈΠ²Π΅ΡΡΠΈΡΠ΅ΡΠ°, Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π° Π½Π° ΡΡΡ
ΠΎΠΌ Π°ΡΡΠ°Π»ΡΡΠΎΠ²ΠΎΠΌ ΠΈ ΡΠΊΠ°ΡΠ°Π½Π½ΠΎΠΌ ΡΠ½Π΅ΠΆΠ½ΠΎΠΌ ΠΏΠΎΠΊΡΡΡΠΈΡΡ
ΠΠ± ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΈΠ» ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ ΠΊΠΎΠ»Π΅Ρ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°, ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ
The paper considers a method for calculation and evaluation of an automated brake proportioning system and it also describes assessment of efficiency while using cohesion forces of an automated system during vehicle braking process (MAZ 256200 taken as an example). A method for efficiency estimation of the vehicle braking equipped with an automated brake proportioning system is graphically presented in the paper. A comparable analysis has been made in order to evaluate vehicle braking efficiency in three various conditions of its wheel motion during braking process. The paper contains description of braking processes for a vehicle at its idealized braking, at braking with an operating automated system and at braking with blocked wheels. Mathematical dependences have been proposed and they make it possible to calculate a coefficient of cohesion forces used by an automated brake proportioning system on the basis of time parameters for vehicle braking process. The proposed mathematical dependences take into account design peculiarities of the automated system, i.e. a diagram of modulator arrangement on axes of the vehicle. The executed analysis for calculation accuracy of the coefficient pertaining to use of cohesion forces of the automated system with and without taking into accout rolling force resistance of the vehicle wheels has demonstrated a possibility to apply the proposed calculation methods for carrying out auto-technical expertise while investigating road-traffic accidents involving transport facilities equipped with such systems as ABS. The paper proposes a dependence for identification of a vehicle braking distance on the basis of the coefficient on use of cohesion forces by the automated brake proportioning system. The executed experimental investigations on both test and serial models of the automated brake proportioning system have allowed to justify theoretical discussions concerning application of tyre-road adhesion in the operational process of the vehicle brake proportioning system. The investigation results have shown high efficiency of the test automated brake proportioning system developed by Chair of Automobiles in the name of A. B. Hredescul at Kharkiv National Automobile and Road University under the following braking conditions: dry road surface and compacted snow cover
ΠΠ± ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΈΠ» ΡΡΠ΅ΠΏΠ»Π΅Π½ΠΈΡ ΠΊΠΎΠ»Π΅Ρ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ½ΠΎΠ³ΠΎ ΡΡΠ΅Π΄ΡΡΠ²Π°, ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Π°Π²ΡΠΎΠΌΠ°ΡΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠΎΡΠΌΠΎΠ·Π½ΠΎΠ³ΠΎ ΡΡΠΈΠ»ΠΈΡ
The paper considers a method for calculation and evaluation of an automated brake proportioning system and it also describes assessment of efficiency while using cohesion forces of an automated system during vehicle braking process (MAZ 256200 taken as an example). A method for efficiency estimation of the vehicle braking equipped with an automated brake proportioning system is graphically presented in the paper. A comparable analysis has been made in order to evaluate vehicle braking efficiency in three various conditions of its wheel motion during braking process. The paper contains description of braking processes for a vehicle at its idealized braking, at braking with an operating automated system and at braking with blocked wheels. Mathematical dependences have been proposed and they make it possible to calculate a coefficient of cohesion forces used by an automated brake proportioning system on the basis of time parameters for vehicle braking process. The proposed mathematical dependences take into account design peculiarities of the automated system, i.e. a diagram of modulator arrangement on axes of the vehicle. The executed analysis for calculation accuracy of the coefficient pertaining to use of cohesion forces of the automated system with and without taking into accout rolling force resistance of the vehicle wheels has demonstrated a possibility to apply the proposed calculation methods for carrying out auto-technical expertise while investigating road-traffic accidents involving transport facilities equipped with such systems as ABS. The paper proposes a dependence for identification of a vehicle braking distance on the basis of the coefficient on use of cohesion forces by the automated brake proportioning system. The executed experimental investigations on both test and serial models of the automated brake proportioning system have allowed to justify theoretical discussions concerning application of tyre-road adhesion in the operational process of the vehicle brake proportioning system. The investigation results have shown high efficiency of the test automated brake proportioning system developed by Chair of Automobiles in the name of A. B. Hredescul at Kharkiv National Automobile and Road University under the following braking conditions: dry road surface and compacted snow cover