Chapter XII. Engine management system
(b) The operation of the variable valve timing system.
(2) Under the action of the variable valve timing system, optimal filling of the cylinders with the working mixture and control of
the ignition timing is ensured. A special algorithm is used to calculate the optimal filling of the cylinders with the working
mixture.
2000 4000
We must comply with the following conditions to activate the canister purge solenoid valve:
The canister purge solenoid valve is controlled by the engine control unit based on a PWM signal in accordance with the
current engine operating conditions. At idle speed, the adsorber valve is always completely closed. In other modes, the degree
of opening of the valve is determined by the air flow determined using a closed-loop algorithm, and can reach 100%.
falls below 94 °C.
• The coolant temperature does not exceed a value that varies depending on the engine
exceeds 97 °C.
(1) The variable valve timing actuator is activated when the engine management system requests that the camshaft and
crankshaft angles be adjusted for maximum fuel economy, optimum driving performance and minimum emissions. The
drive will activate when all of the following conditions are met.
1600
(a) Operating conditions of the solenoid action of the canister purge valve:
• 65.25 °C < coolant temperature < 110.25 °C.
3600
load) under the above conditions.
140
2800
• If a malfunction occurs in the variable valve timing system.
• Time after engine transition to feedback control mode or fuel cut
The system controls the engine cooling fan and the air conditioning fan. The engine control unit controls the activation
and deactivation of these fans depending on the temperature of the coolant and the conditions for turning on and off the air
conditioning system.
drops below 99 °C.
During engine operation, the operating temperature of the 3-way catalytic converter is determined and the time when this
temperature exceeds a safe value is recorded. If the operating temperature of the catalytic converter exceeds a safe
temperature for a certain time, the system regulates the amount of fuel supplied and enriches the mixture in order to reduce
the temperature of the converter. After some time, if the temperature of the converter decreases, the previous composition of
the air-fuel mixture is restored. At the same time, the determination of the temperature of the catalyst continues in the mode
of readiness to take the necessary measures.
sti exceeds 102 °C.
Revolutions, rpm
Coolant temperature, °C
• Engine running time exceeds 150 seconds (coolant temperature is lower than 50.25 °C when starting the engine), or
engine running time exceeds 30 seconds (coolant temperature is higher than 50.25 °C when starting the engine);
• The voltage in the on-board network is below 17 V;
8. Algorithms for controlling the protection of a staged catalytic converter
• The fan turns on and runs at high speed if the temperature of the coolant
engine item:
125
2400
• On-board network voltage: 10.5–16 V.
140 130
(1) To reduce the effect of fuel vapor entering the cylinders during normal engine operation,
(b) Operation of the canister purge solenoid valve
• The fan running at low speed stops if the coolant temperature
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(1) Valve timing is determined depending on the current engine operating conditions (rpm and
• Throttle valve open more than 1.2 but less than 100%.
• The fan turns on and runs at low speed if the coolant temperature
(a) Operating conditions for the variable valve timing system actuator.
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exceeds 2 s;
(1) Conditions and modes of operation of the fan:
10. Control algorithms for the variable valve timing system
1200
130
3200
• The fan running at low speed stops if the coolant temperature
800
125
• Malfunction of the EMS system.
9. Fan control algorithms
• Engine speed is between 300-5000 rpm.
130
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