Volkswagen Ag

Skoda Auto A.s.

Matthias Holz

Ekkehard Pott

Michael Zillmer

David Prochazka

Marc Hladun

Kai Philipp

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.

Method for heating up a catalytic converter

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.

Method and device for stopping and starting the engine of hybrid vehicles

A method and a device are for the optimized starting of an internal combustion engine using a starter, which is connected to a capacitor store, the capacitor store being connected via a DC/DC converter to a vehicle electrical system of a vehicle, and the vehicle electrical system including an energy store for supplying electrical energy having a nominal voltage, and the starter consuming a starting energy for starting the internal combustion engine, which is a function of a temperature of the internal combustion engine, the temperature of the internal combustion engine being measured by at least one temperature sensor and the capacitor store being charged to a setpoint voltage with the aid of a battery via another DC/DC converter, which connects the battery in parallel to the capacitor store parallel to a switch, the setpoint voltage being set by a control unit such that the electrical energy stored in the capacitor store charged to the setpoint voltage is greater than the starting energy ascertained on the basis of the measured temperature.

Method and device for the optimized starting of an internal combustion engine

A method is for controlling the torque of a hybrid drive unit, which includes a combustion engine and at least one electric machine capable of being operated alternatively as a motor or as a generator. The electric machine, when operated as a motor, is powered by an energy storage device and supplies a positive electric motor torque which together with a combustion engine torque of the combustion engine produces a total drive torque of the hybrid drive unit. A hybrid drive unit includes a respective torque control. In the event that a desired torque is greater than a consumption-optimized combustion engine maximum torque, the electric machine is operated as a motor having an electric motor torque. An electric motor maximum torque is specified as a function of at least one state parameter of the energy storage device.

Method for controlling the torque of a hybrid drive unit and hybrid drive unit

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.

Hybrid motor vehicle and method for controlling operation of a hybrid motor vehicle

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 Mor a respective braking power P. When braking is requested with a target value Mat a time t, a total braking momentum M is provided according to the following formula:, if, if.A value M&#x3e;0 is selected for the braking momentum Mat the time t, wherein M&#x3e;0 is a braking momentum provided by a vehicle brake or when braking is requested with a target value Pat a time t, the vehicle is provided with a total braking power P according to the following formula:, if, if.A value P&#x3e;0 is selected for the braking power Pat the time T, wherein P&#x3e;0 is a braking power provided by the vehicle brakes.

Method for operating a hybrid vehicle

A method is for controlling an overrun condition in a hybrid vehicle having a combustion engine and additionally at least one electric motor as well as an overrun fuel cutoff, which interrupts a fuel supply to the combustion engine when the vehicle is in an overrun condition and restores the fuel supply when the combustion engine reaches or falls below a restoring speed. At least in a combustion engine at operating temperature, the fuel supply is restored at a restoring speed of at most 200 min, e.g., at most 100 minabove an idling speed of the combustion engine. The restoring speed may be in the range of the idling speed or only slightly above the latter. The restoring speed is thus clearly lowered as compared to the usual restoring speeds and extends the overrun fuel cutoff phases and thus reduces fuel consumption.

Method for controlling an overrun condition of a hybrid vehicle and hybrid vehicle

A method is for controlling the operation of an exhaust-gas sensor disposed in an exhaust duct of a motor vehicle and equipped with an internal or external sensor heating device, the motor vehicle including a combustion engine and an automatic switchoff, which causes an automatic switching off of the combustion engine when at least one stop condition is present. It is provided that: (a) following an automatic switching off of the combustion engine by the automatic switchoff, a first future instant is determined at which the exhaust-gas temperature in the exhaust duct will drop below a condensation temperature below which condensate precipitation from the exhaust gas may occur; (b) a second instant is determined at which a heat output of the sensor heating device must be interrupted or reduced so that a sensor temperature of the exhaust-gas sensor will have dropped to a maximally allowed sensor temperature no later than the first future instant; and the heat output of the sensor heating device is interrupted or reduced when the second instant is attained.

Method for controlling an operation of a heatable exhaust-gas sensor of a motor vehicle

A hybrid drive unit () for a motor vehicle with an internal combustion engine () and at least one electric machine () optionally operable as a motor or as a generator, has a charge air compressor () for compression of combustion air supplied to the internal combustion engine () and a charge air cooler () for cooling the combustion air. The hybrid drive unit () has a low-temperature cooling circuit () carrying a liquid coolant and is designed separately from a high-temperature cooling circuit of the internal combustion engine () and has a heat exchanger () for cooling the coolant, whereby the low-temperature cooling circuit () includes the charge air cooler () and the electric machine () and/or electronic components () allocated to the electric machine ().

Hybrid drive unit having a low-temperature circuit

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.

Method for operating a hybrid vehicle and hybrid vehicle

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.

Method for operating a hybrid motor vehicle

The invention is directed to a method for controlling fuel injection in an internal combustion engine () having at least one electric machine (), wherein a direct injection system () for direct injection of fuel into at least one combustion chamber () of the internal combustion engine () is associated with the internal combustion engine (), the direct injection system () including a mechanically driven high-pressure fuel pump () for generating a fuel pressure in an accumulator volume () upstream of the at least one combustion chamber (). It is provided that during a startup process of the internal combustion engine () fuel is injected by at least one of the following measures: The startup process can be performed so as to result in considerable fuel savings and low emissions.

Method for controlling fuel injection and a motor vehicle

An electrical energy system () in a hybrid car comprises an electrical motor (), a capacitor () and a battery (). The capacitor () is connected electrically to the electrical motor () and the capacitor () is switched in parallel with the battery () and the capacitor () has a rated voltage greater than 60V and the battery () has a rated voltage of less than 60V.

Electrical energy system in a hybrid car

A hybrid vehicle includes an internal combustion engine with a cylinder head, at least one outlet for exhaust gas which is formed in the cylinder head, a device for directly injecting fuel into a combustion chamber, a spark-ignition device for igniting the directly injected fuel in the combustion chamber, at least one electric drive and an exhaust gas control system which is connected downstream of the combustion chamber and has at least one catalytic converter in at least one exhaust tract. The catalytic converter which is closest to the engine in each exhaust tract is positioned in the exhaust gas control system in such a way that a length of an exhaust pipe between the outlet for exhaust gas in the cylinder head and an end face of this catalytic converter that faces the cylinder head is at least 500 mm.

Hybrid vehicle

A method for operating a hybrid motor vehicle having an internal combustion engine and at least one electric machine is provided. At least one of the electric machines supplies a varying torque to the internal combustion engine such that cyclic irregularities of the internal combustion engine during idling are reduced and, at the same time, the internal combustion engine is operated during idling with an ignition angle and a volumetric efficiency optimized for this operating state and without retarding the ignition angle for building up a torque reserve.

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Lehre, Germany

Matthias Holz