S40/V40
1. General information
2. Operation and maintenance of the car
3. Design and technical characteristics of engines
4. Repair of the engine
5. Transmission
6. Brake system
7. Forward suspension bracket and steering
8. Back suspension bracket
9. Control system of the Fenix 5.1 engine
9.1. Description of system
9.1.1. Sensors of pressure and air temperature
9.1.2. Oxygen sensor
9.1.3. Sensor of position of the camshaft, frequency of rotation and provision of a bent shaft
9.1.4. Sensor of temperature of cooling liquid and detonation
9.1.5. Sensor of provision of a butterfly valve
9.1.6. Management of fuel system
9.1.7. Management of system of ignition
9.1.8. Idling regulator
9.1.9. Control of the cooling system fan
9.1.10. Control of the air conditioner compressor
9.1.11. Output signals of the control unit
9.2. Diagnostics
10. Electric equipment. Conducting and components
11. Body
12. Schemes of electric equipment
 



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9.1.8. Idling regulator

Fig. 9.1. Control system of the Fenix 5.1 engine: 2/14 — the system relay of the engine; 3/1 — the ignition switch; 4/1 — the block of system management of the Fenix 5.1 engine; 6/13 — the fuel pump; 7/15 — the heated sensor of oxygen (HO2S); 7/21 — the RPM meter (RPM) of the petrol engine;
7/22 — the sensor of absolute pressure in a collector (MAR sensor); 7/23 — the sensor of temperature of cooling liquid of the engine (EST); 7/24 — the sensor of temperature of entrance air; 7/25 — the sensor of provision of a butterfly valve; 7/26 — the sensor of a detonation (KS); 7/27 — the sensor of position of the camshaft; 8/2 — the regulator of idling (IAC); 8/6, 8/7, 8/8, 8/9 — nozzles; 8/12 — the valve of a purge of the coal filter (SR); 10/51 — a precautionary lamp of temperature of exhaust gases; 11/2 — the block of safety locks in passenger salon; 24/20 — the 22-contact socket of a plait of passenger salon (C), a plait of a compartment of the engine (A) (gray); 24/23 — the 22-contact socket of a plait of passenger salon; 24/27 — the 12-contact socket of a plait of a compartment of the engine
(A) — a plait of the module of engine management (ESM); 24/33 — the 4-contact socket of a plait of the module of engine management (unified social tax) (B) (Q); 31/25 — a ground contact under the dashboard


The control unit counts idling speed on the basis of signals of the frequency of rotation of a bent shaft and operates the regulator of idling of 8/2 (fig. 9.1) so that the frequency of rotation was supported at the invariable level. The regulator has a straight-line characteristic.
On one of socket conclusions via the relay tension of the rechargeable battery moves, the second conclusion is attached to BU. For management of an air stream of BU at the fixed frequency closes a solenoid chain on "weight", creating magnetic field which tension changes depending on duration of impulses. Thus there is a changeable counteraction to the squeezing effort of a returnable spring to the valve and the size of the channel between inlet and final openings is respectively regulated.
In case of failure in work the returnable spring will press the regulator valve to a stopper and will open an opening for a limited admission of air that will lead to small increase in frequency of rotation idling.
When the sensor of provision of a butterfly valve shows that the gate is closed and the engine idles, BU by means of the regulator of idling regulates the frequency of rotation of the engine depending on a signal of the sensor of temperature of cooling liquid and loading.
When receiving BU of signals from the switch of pressure, the control panel of a microclimate or the control unit of the automatic transmission demonstrating turning on of the compressor of the conditioner of air or inclusion of transfer there is an increase in an air stream that provides maintenance of invariable value of frequency of rotation idling, tracing it by means of the sensor. Such adjustment takes place also when BU turns on the electric fan of cooling.
Management of idling is adaptive, i.e. BU "studies" as far as in these specific conditions the idling regulator has to be open. Information on it is stored in memory and used at repeated launches of the engine. In case of failure in a control system the regulator of idling is installed in the fixed situation corresponding to value of the frequency of rotation idling exceeding normal.
As the sensor of provision of a butterfly valve has no the fixed provision of idling, BU is supplied with adaptive function which provides entering in memory of the smallest of the registered values which is interpreted as closing of a butterfly valve. The provision of completely open butterfly valve pays off addition of the fixed value of a corner to situation in which the gate is closed.

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9.1.7. Management of system of ignition
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9.1.9. Control of the cooling system fan