FR2788733A1 - MOTOR VEHICLE DRIVE SYSTEM - Google Patents

Abstract

Drive system comprising a drive unit (12), a gearbox (20) and a clutch (16) providing the connection between the unit (12) and the gearbox (20). A starter (56) equips the drive unit (12). A control installation (36) controls the starter (56) only if a brake actuation detection device allows it.

Description

The present invention relates to a drive system in particular for

  motor vehicle comprising: - a drive unit, - a gearbox, - a clutch which provides the torque transmission link between the drive unit and the gearbox, - a starting device for starting the drive unit, - a control installation which, following a launch order, can control the starting device for

start the power unit.

Description:

  Such a drive system is known, for

  example according to document DE-693 01 304 T2 (EP 0 611 345 B1).

  We detect the implementation of this drive system by connecting the power supply to the

  ordered. To do this, press a key switch.

  After detecting the operation, the control circuit receives a large number of sensor signals which, on the one hand, reproduce the position of the clutch and, on the other hand, indicate the gear ratio which has passed. If a report is initiated when the implementation is recognized, this

  which is generally predictable because in vehicles with

  automatic clutch, in the idle state, a gear is engaged to prevent the vehicle from moving, the system

  thus prohibits disengagement of the clutch and blocks the dis-

  positive start; under these conditions, the wish to

  starting the system does not start the mo-

  tor. This avoids that when the clutch is engaged and

  that a gear ratio is passed, there is no risk that while

  the ignition key in its operating position on

  suddenly advance the vehicle.

  To start the engine of such a drive system, the driver, after having tried for example to turn the ignition key, the clutch being engaged and a gear ratio set, but without reaction from the starter, releases the ignition key, actuates the gear lever to put the gearbox in neutral position then turns the ignition key again. It is only after having put the gearbox in its neutral position and that

  the clutch has been controlled in the disengagement direction that fi-

  Finally, the starter can be started.

  The present invention aims to develop a drive system improving the comfort of use

with better security.

  To this end, the invention relates to a drive system of the type defined above, characterized in that: - a brake actuation detection device detects the actuation of a brake device, and - the control facility can only control the device

  to start the drive unit only if the

  brake actuation detection device detected a

  actuation of the brake device.

  The drive system according to the invention allows

  starts the drive unit as desired by the driver

  but the controller does not actually respond to this request unless the driver makes sure

  actively by applying the brake, only during de-

  marrage, the vehicle is not likely to roll accidentally-

  is lying. In addition, the driver is obliged to intervene actively by actuating for example the brake pedal or the

  if necessary by applying a parking brake so that the unit can

  can be launched. So the driver is forced

  actively intervene with security measures to avoid

  ter any accidental movement of the vehicle, so that even if a gear is put, the only actuation

  brake prevents the vehicle from moving chao-

  tick; the driver may also be obliged to order

  der normally the clutch pedal, for example when a gear is put in the vehicle stop position. According to another characteristic of the system

  of the invention which can be combined with the system

  As described above, the control system cannot

  control the starting device to start the mo-

  only if an actuation detection device

  clutch has detected the clutch disengaged state. That if-

  also means that this means actively ensures that

  the drive unit can only be started if a clutch is

  held disengaged creates a torque transmission cut in the transmission line. It should be noted that the concept of disengaged clutch here means only a clutch that is not fully disengaged; it is thus possible to disengage

  the clutch only partially, at least however enough

  so that the clutch cannot transmit torque

important driver.

  The start order can for example be created by actuating an ignition switch in particular

an ignition lock.

  The security measures according to the invention of the system

  drive teme are particularly suitable in the

  case of a manually operated clutch and a gearbox

  braids also with manual control. In principle the system

  according to the invention may include as em-

  clutch both an automated clutch with an actuator

  clutch or an automated gearbox.

  As another safety measure, the control device controls the starting device to start the drive unit only if a gearbox condition detection device has found that the gearbox

was in a neutral position.

  The present invention further relates to a method

  drive system control die that includes a

  power unit, a clutch and a gearbox.

  The method according to the invention is characterized by the following steps: a) it is detected if a brake device has been actuated and / or if a clutch has been disengaged, b) it is detected if a start command has been created to start the drive unit, c) after detecting a start command, the drive unit is launched only if the actuation of a brake device has been detected or / and if the clutch has been detected

was disengaged.

  The present invention will be described below in

  reference to the single appended figure.

  Figure 1 shows a block diagram of a system

  drive teme generally bearing the reference 10 such as that of motor vehicles. This drive system

  includes a drive unit 12, for example a mo-

  internal combustion tor 12 whose crankshaft 14 is connected to the input of an automatic clutch generally bearing the reference 16. The output of the clutch 16 is connected by a

  gearbox input shaft 18, in connection with rota-

  tion with a gearbox 20. This gearbox is represented

  tée as automatic gearbox with a gearshift lever 22. The output shaft 24 of the gearbox is connected to a differential 26 which drives the drive wheels 32, 34 via two shafts

drive 28, 30.

  The drive system further comprises a control installation 36 receiving signals from several

  sensors and commander, as described below, diff-

  various components of the drive system 10.

  Thus, the control installation 36 receives for example a first speed signal from a speed sensor 38 which detects the speed of rotation of the crankshaft 14 and thus the speed of rotation of the engine at

  internal combustion 12. A second rotational speed sensor

  tion 40 detects the speed of rotation of the input shaft 18 of the gearbox and, by a sensor device 42, the control installation 36 also receives information concerning the gear ratio used in the gearbox

  gears 20 or the one to be passed or the direction

  tion in which the gear lever 22 was actuated. In addition, the control installation 36 receives signals from another speed detection device 44 which

  detects the speed of rotation of the wheels 32 and / or 34. A cap-

  ignition lock switch 46 detects the introduction of the

  ignition key 48 in the corresponding lock and posi-

  tion in which the ignition key 48 has been turned. In addition, the control installation 36 receives information by a corresponding sensor device indicating the

  degree of actuation of the accelerator pedal 50; so

  Correspondingly, the control system 36 receives information indicating to it whether and to what extent the brake pedal 52 has been actuated. Depending on the signals supplied by the sensors mentioned above or the signals from other sensors, not shown but usual for those skilled in the art,

  the control system 36 controls the various components

  health of the drive system. In particular the instal-

  control unit 36 controls the internal combustion engine 12, that is to say for example an injection installation or an engine throttling installation; the control is essentially done on the basis of the detected actuation of

  accelerator pedal 50. In addition, the installation of

  command 36 controls a clutch actuator 54 of the clutch

  automatic 16 to disengage clutch 16 for example

  during operation when the detector 42 detects actuation of the gearshift lever 22, then control the gearbox 20 to execute the desired gear change and, finally, engage the gear again

clutch 16.

  The following description concerns the se-

  lon which at the start of implementation, using the control system 36, action is taken on the different

  components of the drive system to perform the procedure

  boot time as quickly as possible with however

  less the greater security possible and the greater

comfort for the driver.

  First, the sensor 46 detects the engagement of the ignition key 48 in the ignition lock. Through

  engagement of the ignition key in the lock, the conduc-

  In principle, the author indicates that he wants to activate the system.

  The control installation 36 thus recognizes, by detecting the engagement of the ignition key 48, the activation of the system

  even before the driver takes other measures to

  laugh and go. It is further assumed that in the state of decommissioning of the entire system 10, the clutch 16 is necessarily put in the full clutch position and the gearbox 20 is necessarily in a position which is not not the neutral position, for example that of the first report. Thus, without the driver having to perform any action, when stopping a vehicle, it can be ensured that the latter does not continue to roll accidentally.

  dentically, even if no parking brake is applied.

  Directly after detecting the activation of the system, the control installation 36 controls the actuator

  clutch 54 to move it from its complete state

  gear engaged, anterior and order it in the direction of the

  clutch. If the ignition key 48 is then turned to the ignition position, which ultimately corresponds to the emission of a contact command from the sensor 46, the control installation 36 receives this sensor signal and then commands according to the desire of the driver to put the system into operation, a wish which is recognized by the rotational movement of the ignition key 48 in the start position,

  to control the starter 56 and start the drive unit 12.

  As previously the clutch 16 has been disengaged by the clutch actuator 54, that is to say that the clutch has been disengaged sufficiently so as not to transmit significant torque, the starting cannot cause movement

  chaotic of the vehicle even if a gear ratio is put.

  However, there is still the risk that due to

  Torque transmission link initiated between the mo-

  12 and the gearbox 20 and so the suppres-

  engine brake effect, the vehicle may move during starting, especially on a

  slope. To avoid this, the control system 36

  requests start 56 to start the drive unit 12 only if at the same time the actuation of the vehicle brake device is detected, for example if it is detected that the brake pedal 52 has been depressed sufficiently. Instead of or in addition to the detection of the actuation of the brake pedal, it is also possible to detect the activation of a parking brake (parking brake) or use signals coming directly from the brake system for different actuators, to indicate the use of the brake device. If under these conditions, the sensor 46 provides a corresponding start order signal, and if at the same time it is recognized

  that actuation of the brake device prevents any

  unwanted placement of the vehicle, then the installation of

  command 36 generates the starter control command 56 for

start the drive unit 12.

  The fact that according to the invention,

  actuation of the brake device as a criterion for freedom

  ration to start the motor unit 12 makes the achievement of

  the invention particularly interesting to be used in com-

  pairing with existing manual clutches or manual gearboxes. In such systems by control

  clutch or gearbox, you can

  tomatically take into account that the transmission line

  is cut at the clutch and / or the gearbox-

  its, so that first of all at start-up, we can mainly

  cipe assume that there will be no chaotic movement of the vehicle. The compulsory actuation of the brake device can however ensure that regardless of the action

  on the clutch or gearbox, any shifting is avoided

unwanted cementing of the vehicle.

  As a release criterion, alternative for lan-

  cer the drive unit or if necessary also in addition to the release criterion for actuating the brake device, in a conventional manual control system, one can use the clutch actuation. In this case also by

  example depressing the clutch pedal 58 can provide

  set a corresponding actuation signal; this signal for-

  rait also be detected directly at the clutch to know if it is at least disengaged enough to no longer be able to transmit significant engine torque. We thus have an even greater security. Of

  more, even in a manual gearbox, you can

  tect if this gearbox is in neutral switching position and only release the drive unit 12 when the variant or in addition to the two criteria mentioned above, the gearbox is in neutral switching position. It is however advantageous under these conditions that at least

  the actuation of the brake device serves as a sup-

  additional, because then in all cases, even when the li-

  transmission is cut, we can avoid any

  unwanted movement of the vehicle on a sloping road.

Claims (6)

R E V E N D I C A T I ON S   1) Drive system, in particular for a motor vehicle comprising: a drive unit (12), - a gearbox (20), - a clutch (16) which provides the transmission link   torque between the drive unit (12) and the gearbox braids (20),   - a starting device (56) to start the mo-   trice (12), - a control installation (36) which, following a   launch order, can control the launch device   marrage (56) for launching the drive unit (12), characterized in that - a brake actuation detection device detects the actuation of a brake device, and   - the control installation (36) cannot control the device   positive start (56) to start the drive unit (12) only if the brake actuation detection device   detected an actuation of the brake device.   2) Drive system according to claim 1, characterized in that   the control installation (36) cannot control the device   start tif (56) to start the drive unit (12) only if   a clutch actuation detection device has   sensed the disengaged state of the clutch (16).   3) Drive system according to claim 1 or 2, characterized in that   the start order is created by actuating an inter-   ignition switch, in particular an ignition lock.   4) drive system according to one of claims 1 to 3,   characterized in that the clutch is manually operated and the gearbox also manually operated.    ) Drive system according to one of claims 1 to 3, characterized in that   the clutch (16) is an automated clutch with an action-   neur (54) and the gearbox (20) is a gearbox automated tresses.   6) drive system according to one of claims 1 to 5,   characterized in that the control installation (36) controls the starting device (56) to start the drive unit (12) only if a gearbox condition detection device (42) has   detected the neutral position of the gearbox (20).   7) Method of controlling a compressed drive system   nant a drive unit (12), a clutch (16) and a gearbox (20), process characterized by the following steps: a) it is detected if a brake device has been actuated and / or if a clutch (16) has been disengaged, b) it is detected if a start order has been created to start the drive unit (12), c) after having detected a start order, the drive unit is started (12) only if it has been detected actuation of a brake device or / and if it has been detected that the clutch (16) is disengaged.