摘要:
A method for carrying out a hot start in an internal combustion engine has a hot start condition that is recognized on the basis of the coolant temperature and the intake air temperature. A hot start identifier is stored when the coolant temperature and the intake air temperature have both reached a predetermined limit value at least once during a post-operation time after the internal combustion engine is turned off. At the next start of the internal combustion engine, the hot start is then carried out when the hot start identifier is stored and the coolant temperature still lies above its limit value. The method is thus based on temperature sensors that are already present in the motor control system. Therefore, no additional temperature sensors, for measuring the temperature of the fuel, are required.
摘要:
An injection valve has a magnetic actuator and an injector needle able to be moved axially by the magnetic actuator. To meter a fluid by the injection valve the magnetic actuator is activated for an individual metering process with at least one actuation signal with a first or second signal waveform. The two actuation signals differ from one another in that, on activation of the magnetic actuator by the actuation signal with the first signal waveform, less energy is transmitted to a magnet unit of the magnetic actuator than during activation of the magnetic actuator by the actuation signal with the second signal waveform. The magnetic actuator is activated by the actuation signal with the second signal waveform if an activation of the magnetic actuator by the actuation signal with the first signal waveform leads to an undesired premature closure of the injector needle.
摘要:
In order to reduce the quantity deviation of a fuel injection valve, it is proposed according to the various embodiments that a test injection be carried out during an overrun cut-off phase of a motor vehicle in operation. In the process, the fuel rail (2) is closed on the inlet side and the selected injection valve (1) is activated. A quantity difference between the predetermined setpoint and the actual value can be determined by measuring a pressure difference in the fuel rail (2) before and after the test injection. This results in a correction factor with which the activation for the selected injection valve (1) is corrected for subsequent injections.
摘要:
The invention relates to a method for operating an internal combustion engine comprising a fuel pressure accumulator, in order to provide fuel at a nominal pressure, pressure in a fuel pressure accumulator being generated by means of a high-pressure pump. According to said method, the high-pressure pump is supplied with a fuel flow via a volume flow control valve. In a first operating mode, the pressure in the fuel pressure accumulator is set to the nominal pressure, by regulating the fuel flow of the fuel delivered to the high-pressure pump by means of the volume flow regulating valve. In a second operating mode, the pressure in the fuel pressure accumulator is set to the nominal pressure, i.e. more specifically, the pressure in the fuel pressure accumulator is reduced to the nominal pressure.
摘要:
In order to diagnose a burner air ratio, a fuel/air mixture of an internal combustion engine is either enriched or diluted during operation of the burner as a function of an instantaneous state of the mixture. Resulting signal levels of lambda probes disposed upstream and downstream of the catalytic converter are evaluated.
摘要:
In order to reduce the quantity deviation of a fuel injection valve, it is proposed according to the various embodiments that a test injection be carried out during an overrun cut-off phase of a motor vehicle in operation. In the process, the fuel rail (2) is closed on the inlet side and the selected injection valve (1) is activated. A quantity difference between the predetermined setpoint and the actual value can be determined by measuring a pressure difference in the fuel rail (2) before and after the test injection. This results in a correction factor with which the activation for the selected injection valve (1) is corrected for subsequent injections.
摘要:
Disclosed is a fuel supplying device of an internal combustion engine, comprising a low-pressure circuit, a high-pressure pump coupled to the low-pressure circuit and conveys fuel into a fuel reservoir, a volume flow control valve assigned to the high-pressure pump, an electromechanical pressure regulator connected to the fuel reservoir and the low-pressure circuit and can direct fuel from the fuel reservoir into the low-pressure circuit, a regulating mechanism which generates an actuation signal for the volume flow control valve by a first controller in a first mode which generating an actuation signal for the electromechanical pressure regulator with the aid of a second controller in a second mode. The mode of the fuel supplying mechanism is switched in accordance with a fuel pressure error value resulting from a detected fuel pressure and a predefined fuel pressure. The mode can additionally be switched according to the throughput of the high-pressure pump.
摘要:
A method and system for controlling an internal combustion engine is provide. The engine has a fuel-supply device, a low-pressure circuit and a high-pressure pump, to which a control valve for a volumetric flow is allocated is provided. Said pump is coupled on the inlet side to the low-pressure circuit and transports fuel to a fuel accumulator. An estimated value of the drive torque of the high-pressure pump is determined in accordance with the fuel pressure in the fuel accumulator. A loss torque is determined in accordance with the estimated value for the drive torque of the high-pressure pump and additional loss-torque fractions, which are dependent on a motor speed and additional operating variables. A target torque is determined in accordance with the loss torque and an actuating signal for controlling an actuator of the internal combustion engine is generated from the target torque.
摘要:
Disclosed is a fuel supplying device of an internal combustion engine, comprising a low-pressure circuit, a high-pressure pump coupled to the low-pressure circuit and conveys fuel into a fuel reservoir, a volume flow control valve assigned to the high-pressure pump, an electromechanical pressure regulator connected to the fuel reservoir and the low-pressure circuit and can direct fuel from the fuel reservoir into the low-pressure circuit, a regulating mechanism which generates an actuation signal for the volume flow control valve by a first controller in a first mode which generating an actuation signal for the electromechanical pressure regulator with the aid of a second controller in a second mode. The mode of the fuel supplying mechanism is switched in accordance with a fuel pressure error value resulting from a detected fuel pressure and a predefined fuel pressure. The mode can additionally be switched according to the throughput of the high-pressure pump.
摘要:
An estimated value of the amount of fuel which is metered into a cylinder per working cycle is calculated. An estimated value of the indicated torque of the internal combustion engine is calculated as a function of the estimated value of the amount of fuel. An emergency operating mode of the internal combustion engine is actuated if the estimated value and a setpoint value of the indicated torque fulfill a predefined condition.