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Begin OCR Text:
influenced by atmospheric pressure Th_s permits
the armature ( 1 1 ) to move further to the right In
th is pos_t_on with the armature at the e_treme r_ght,
the pressure sensor informs the control un _t that
ma_imum poss_ ble fuel can now be _njected
When the engine starts and the underpressure
from the eng ine _ nlet duct i nfluences the left-hand
s_de of the d_aphragm (8), atmospher_c pressure
forces the d_aphragm over to the part_load stop
(1 O) At the same t_me. the d _aphragm bel lows (7)
e_pand s_nce they are _ nfl uenced by the under-
pressure inside the pressure sensor and they move
the armature a bit to the l_ft Dependi ng upon the
v,,o,__u pressure in the _n let duct (eng1ne load) the arma-
Fl$. 2_69. Pressure senGDr ture adjusts jtse_f to different positions dur_ng
driv1ng.
At ful l-throttle driv_ng, the pressure in the _ nlet duct
w_ l be almost equal to the atmospher_c pressure, at
which po_nt the armature takes up the same pos i-
t_on as when the eng _ne starts
The pressure sensor, f_g 2-7O, _s bu ilt into a l _ght- The funct_on of the valve (1 3) is to prevent pres-
al loy hous ing sure _mpu Ises _n the inlet duct (from the piston mo-
When the eng ine 1s sw_tched off, atmospher_c vement) from being conveyed _nto the pressure
pressure e_ists on both s_des of the d iaphragm sensor This valve has a smal l hole wh _ch con-
(8) and the movable armature (1 1 ), wh_ch is sus- stricts the impu Ises Dur_ng sudden acceleration,
pended fr_ction-free _n both leaf springs (3 and 6), when a_r wil l rush into the pressure sensor. the
1s pressed aga1nst the ful l-load stop (9) by the hote in the va Ive is insufficient to cope with th is so
spr_ ng (2) Moreover, both the deflated d _aphragm that the ent_ re valve is moved by spr_ng pressure
bel lows (7) are pressed together, s ince they are away from the open ing and a _r _s al lowed to enter
1 2 3 _ _ 6 _ 8 Fig. 2=1O Pressure aensor
l Damp_ng spring
2 Co_ l spring
3 Leaf spring (suspension)
4 Seconday winding )
5 Primay winding
6 Leaf spring (suspension)
7 Diaphragm bellows
8 Diaphraam
9 Full_load stop
IO Part_load stop
I l Armature
l2 _lectric connection
13 Valve
l 4 Hose connection
2 3O
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