DE202006003700U1 - Drive train of vehicle, comprising specifically designed accelerator pedal for reduction of friction between engine parts when pedal is not pressed - Google Patents

Abstract

The vehicle can be used in an idling mode in order to save energy without the loss of control occurring when the clutch is released. The accelerator pedal (1) is positioned above a coil spring (2) in order to achieve a particular operating pattern. A slight change of the pattern is caused by a clutch unit (4) assembled of a spring supported pin engaging with a recess at a complementary element. When the pedal (1) is positioned in a particular angle the idling mode is activated by a magnetic switch (5).

Description

Known are powertrain concepts with manual and automatic transmission, as well as combinations of both. The transmission works with one Clutch (hand or automatic) together and has the task the Adjust the engine speed to the driving speed and accelerate to enable. The accelerator comes with the task of controlling the engine power. If you take the gas while driving away "that's how it is to the so-called effect of the "engine brake", ie through the Internal friction in the engine causes the vehicle to slow down. This is desired when the vehicle is to be decelerated. The engine brake means however, in particular, below closer explained Driving situations, a waste of energy. The energy waste could to avoid by manual disengagement. Manual disengagement and the re-engagement means, however, especially at higher speeds, a security risk because control of the vehicle is less.

Of the Drive train according to the invention allows in certain driving situations, it is the waste of energy described above without endangering driving safety.

Reached This is accomplished by two subassemblies in the powertrain: a special one Device for controlling engine performance (eg special below described accelerator pedal) and an additional module (Z. B. a Electromagnetically switchable freewheel). In the interaction of both Assemblies can be the motor vehicle in certain driving situations to roll in the freewheel. When the vehicle rolls in freewheeling becomes energy saved because the engine speed up to the idle speed is lowered. In comparison, in a "motor-brake" role, more energy would be transmitted internal engine friction are consumed, respectively, the vehicle slowed down unnecessarily become. This also applies when using the well-known overrun fuel cutoff. If you want to accelerate again when using the solution according to the invention only accelerate again as soon as the engine speed returns to the driving speed Corresponding drive torque can be transmitted again (similar to on a bicycle with freewheel pedals).

The Driving situations where the engine brake is a waste of energy means is e.g. the downhill and the driving in the plain, when the vehicle speed is lowered slower than with the engine brake can be, e.g. the approach to obstacles at clear Put. The potential for saving energy or gasoline can be used for one Middle class cars are estimated as follows:

Example:

Overland travel 500km highway, ⌀ speed 100km / h

additional Advantages of the solution according to the invention are, that with the energy saving also a lower pollutant emission and less engine wear is.

One Another advantage of the invention is that you at a Cars with manual transmission only to start and stop the mechanical Actuate clutch need, all other switching operations could done in freewheeling.

An example of a realization is in 1 and 2 and can be explained as follows:

1 above shows the special accelerator pedal. For clarity, the components are shown on the axis of rotation E pulled something in the width. No. 1 shows the direction of actuation of the accelerator pedal the angle α. No. 2 shows the spring to achieve the actuation characteristic (Cf. 2 ). No. 3 shows the throttle cable, the throttle of the fuel injection system (no. 7 ). No. 4 shows the locking device, which ensures a slight exaggeration of the actuation characteristic (cf. 2 ). No. 5 shows the electric switch, which in a certain angular range of the accelerator pedal, the freewheel no. 9 via the magnetic switch no. 10 actuated.

1 Below shows schematically the automotive drivetrain. No. 6 shows the engine. No. 7 shows the injection system. No. 8th shows the clutch. No. 9 shows the electrically switchable freewheel. No. 10 shows the magnetic switch. No. 11 shows the electrical control line. No. 12 shows the gearbox (can be shift or automatic transmission in this example). No. 13 shows the cardan shaft to the drive wheels.

A

= Leerlaufstellung der Einspritzanlage,

B

= mit dem Winkel α. ansteigende Drosselklappenöffnung (= steigende Motorleistung),

C

= Freilauf ausgeschaltet,

D

= Freilauf eingeschaltet

S

= Bereich der Energieeinsparung

2 shows the actuation characteristic of the accelerator pedal and the states for throttle position and switching state of the freewheel in dependence on the operating angle α. Where:

A

= Idling position of the injection system,

B

= with the angle α. rising throttle opening (= increasing engine power),

C

= Freewheel off,

D

= Freewheel switched on

S

= Range of energy savings

The Operating characteristics is characterized by a constant Increasing pedal force F. The locking device is a slight increase in the Operating characteristics Achieved so that the vehicle driver is able to easily adjust the position between areas C and B. In this area will be S the energy saving achieved. If the accelerator pedal is released, go the accelerator pedal independently except for the position angle α = 0 back and the usual motor brake according to the prior art included Thrust shutdown is reached (area C). Ie. the driving safety is practically at the same height as usual today Powertrain systems.

Usual powertrain systems have only the operating states B and C on. The drive train system according to the invention can starting z. B. from "normal" driving in the state B at desired Slowing down the speed or downhill by taking gas off in state S, compared to conventional powertrain systems, Save energy. If the ride does not go downhill, you can just go back more "gas give "and the driving speed increase again. However, starting from state S, one can also get into the area of the "engine brake" by taking further "gas" and the Driving speed stronger as idle decrease. The energy saving is the greater, the more often and longer the driver manages to stay in the area S with the gas pedal. Thus, in city traffic, an energy saving of about 10%, be achieved in accordance with predictive driving style.

Especially in motor vehicles with automatic transmissions solutions according to the invention make sense, where the freewheel of an on-board electronics, depending on Sensor readings such. B. driving speed, acceleration, Engine speed, gear stage, drive torque and / or their temporal change be switched. Is appropriate then also an indication of the switching state of the freewheel through a signal lamp.

Claims (5)

Automotive powertrain characterized by that in the drive train a switchable freewheel to save energy and pollutants is included. Automotive powertrain with switchable freewheel according to claim 1 characterized in that the device for controlling the Motor power simultaneously turns the freewheel. Automotive drive train according to claim 1 or 2 characterized in that the freewheel is mechanical, electromagnetic, pneumatic or switched hydraulically. Motor vehicle driveline according to one of the preceding claims characterized in that the freewheel of an on-board electronics, dependent of sensor readings such. B. driving speed, acceleration, Engine speed, accelerator pedal position, gear stage, drive torque and 1 or whose time change is switched. Motor vehicle drive train according to one of the preceding claims, characterized in that the Switching state of the freewheel from a signaling device (eg lamp) is displayed to the driver.