摘要:
The invention relates to a method for at least temporarily increasing an exhaust gas temperature of a spark-ignition, direction injection internal combustion engine (10) involving at least one measure, which is executed by the engine, whereby this at least one measure consists of a spark retarding and of a multiple injection (ME). During the multiple injection (ME), at least two fuel injections into the cylinder (12) are carried out within an induction cycle and compression cycle of a cylinder (12) of the internal combustion engine (10), and the latest of these injections ensues during a compression cycle of the cylinder (12). The invention also relates to the utilization of the method. According to the invention, a control end of an injection angle (αEE) of the latest injection is at least temporarily set to between 80 and 10° before an upper ignition dead center (ZOT) when operating with multiple injection and/or an ignition angle (αZ) is at least temporarily set to between 10 and 45° after the upper ignition dead center (ZOT) also when operating with multiple injection. A combination of both measures enables a dramatic acceleration of the warming up of a catalytic converter (16) that is connected downstream from the internal combustion engine (10).
摘要:
The invention relates to two methods for controlling a fuel metering of a direct-injection internal combustion engine (10) in a multiple injection operating mode according to which at least two fuel injections into a cylinder (12) are carried out during a compression cycle of the cylinder (12) of the internal combustion engine (10) by means of at least one injection valve (22). The invention provides that a pressure (rail pressure, PR), under which the fuel is stored in front of the injection valve (22), is present in such a manner and/or injected fuel portions of the individual injections of a combustion cycle and/or a total fuel quantity, which is injected during a multiple injection, are varied in such a manner as to prevent a forthcoming valve opening time (Δt) of the injection valve (22) from falling below a preset valve opening time (ΔtK) during at least one injection of a combustion cycle. The inventive measures ensure, with simple means, a precise fuel metering in the multiple injection operating mode and thus enable an application of the multiple injection operating mode over wide operating ranges, particularly also in the low load operating mode and idle operating mode.
摘要:
At least one chemical heating measure, which causes an increase in the catalytic converter temperature essentially by introducing into the exhaust gas channel additional chemical energy in excess of energy provided at an initial engine operating point, is combined with at least one thermal heating measure, which causes an increase in the catalytic converter temperature essentially by introducing into the exhaust gas channel additional thermal energy in excess of energy provided at an initial engine operating point, so that a major fraction of the chemical energy is introduced temporally before a major fraction of the thermal energy is introduced.
摘要:
The invention relates to a method for heating up at least one catalytic converter (34) that is disposed in an exhaust gas duct (28) of an internal combustion engine, especially an NOx storage catalytic converter (34) which is mounted upstream of a precatalytic converter (30, 32). According to the invention, at least one chemical heating measure causing a temperature increase in the catalytic converter (34) that is to be heated substantially by means of chemical energy which is fed into the exhaust gas duct (28) in addition to the energy supplied at an original engine operation point, and at least one thermal heating measure causing an increase in the temperature of the catalytic converter especially by means of thermal energy that is supplied in addition to the energy supplied at an original engine operation point, are combined in such a way that a main portion of chemical energy is supplied before a main portion of thermal energy.
摘要翻译:本发明涉及一种用于加热至少一个催化转化器(34)的方法,所述催化转化器(34)设置在内燃机的排气管道(28)中,特别是NO x X存储催化转化器(34) ),其安装在预分解转换器(30,32)的上游。 根据本发明,至少一种化学加热措施导致催化转化器(34)的温度升高,该催化转化器基本上通过供应到排气管道(28)中的化学能被加热,除了所提供的能量 在原始发动机操作点处,以及至少一个导致催化转化器的温度升高的热加热措施,特别是通过除了在原始发动机操作点供应的能量之外提供的热能,这些热加热措施被组合在一起 化学能的主要部分在热能的主要部分之前供应的方式。
摘要:
A method controls an operation of a motor vehicle equipped with a hybrid drive unit having a combustion engine and at least one electric machine that can be selectively operated as a motor or as a generator. The electric machine, when in generator mode, charges an energy store and/or supplies power to a vehicle electrical system of the motor vehicle. In generator mode, the electric machine is operated in alternating intervals, while maintaining predefined boundary conditions. In a first interval, the electric machine is operated with a first high electrical power output that is higher than an actual power consumption of the vehicle electrical system of the motor vehicle. The electric machine is switched off in a second interval. This largely prevents the electric machine from approaching operating points under light load which have a low efficiency and achieves a fuel advantage in comparison to a continuous operating mode.
摘要:
In a method for operating a hybrid vehicle with an electric motor coupled with a multi-cylinder internal combustion engine having at least one cylinder that can be switched off, with a first partial momentum, from an overall momentum provided to the vehicle, being provided by the internal combustion engine and a second partial momentum from the electric motor, and the second partial momentum is used specifically for dampening a cyclic irregularity of the internal combustion engine. Further, means are provided in a hybrid vehicle control, by which the second partial momentum can be used specifically to dampen the cyclic irregularity of the internal combustion engine when one or, if necessary, several cylinders are switched off.
摘要:
In a method and a device for engine stop/engine start of hybrid vehicles, which includes an internal combustion engine and an electric machine which is coupled to the internal combustion engine and is selectively able to be operated regeneratively or motively, the engine speed can be detected and compared to a limit speed to initiate the stopping of the engine in a hybrid vehicle using an automatic start/stop mechanism, and if the engine speed drops to the threshold speed, the engine is stopped, the electric machine being switched over into the motive or the regenerative operation when the limit speed is reached; the electric machine assuming the limit speed, whereas the fuel supply of the internal combustion engine is shut down or remains shut down and the electric machine initiates the stopping of the internal combustion engine.
摘要:
A hybrid vehicle has an internal combustion engine and an electric motor, in which at least one electric motor converts kinetic energy into electricity in a generator mode and can provide a generator-created braking momentum MG or a respective braking power PG. When braking is requested with a target value MSoll at a time t1, a total braking momentum M is provided according to the following formula: MSoll=MG, if MSoll≦MSchwell MSoll=MG+MF, if MSoll>MSchwell. A value MOffset>0 is selected for the braking momentum MG at the time t1, wherein MF>0 is a braking momentum provided by a vehicle brake or when braking is requested with a target value PSoll at a time t1, the vehicle is provided with a total braking power P according to the following formula: PSoll=PG, if PSoll PSchwell. A value POffset>0 is selected for the braking power PG at the time T1, wherein PF>0 is a braking power provided by the vehicle brakes.
摘要:
A method for operating a hybrid motor vehicle which has an internal combustion engine and at least one electric machine is provided. When turning off the internal combustion engine and/or when starting the internal combustion engine, a torque characteristic of the electric machine for starting the internal combustion engine or turning off the internal combustion engine is feedforward-controlled.
摘要:
A device for supplying exhaust gases from an internal combustion engine to a catalytic converter, having multiple exhaust gas supply lines including at least one exhaust gas supply line that serves as a heat-conveying line to promote a transfer of exhaust gas heat to the catalytic converter and at least one other exhaust gas supply line that serve as a heat exchanger to promote an extraction of heat from the exhaust gas upstream of the catalytic converter. A switchable control mechanism controls a flow cross-section of at least one of the exhaust gas supply lines. The exhaust gas supply lines are arranged as a bundle of pipes including individual pipes which are spaced apart and extend to the catalytic converter so that the exhaust gas supply line that is the heat-conveying line is arranged as an inner pipe in the bundle and is surrounded around its circumference by the exhaust gas supply lines that are heat exchangers, which are spaced some distance from one another in a circumferential direction of the heat conveying line. The exhaust gas supply line that is the heat-conveying line has a cross-section that is smaller than a cross-section of the exhaust gas supply line that is the heat exchanger.