JP5700779B2 - Vehicle start control system - Google Patents

Description

  The present invention relates to a start control system in a vehicle such as a lorry having a mechanical automatic transmission.

In the start control system for a vehicle having a mechanical automatic transmission, if it is difficult to start at the time of automatic start, the engine speed is controlled to be higher than normal at the time of start standby in a half-clutch state, and A technique for selecting a low gear position for the transmission at that time is known.
However, this technique is to deal with the problem at that time and is different from the technique having a so-called “learning function” as a control content in order to prepare for the next start.

As another conventional technique, a technique for increasing the idling rotational speed corresponding to the deviation between the required actual compression ratio and the maximum actual compression ratio has been proposed (see Patent Document 1).
The related art (Patent Document 1) is a technology related to starting assistance, but does not execute starting assistance during start waiting.

JP 2007-332912 A

  The present invention has been proposed in view of the above-described problems of the prior art, and it is an object of the present invention to provide a vehicle start control system that can appropriately increase the idle speed at the next start during start standby. Yes.

Start control system of the present invention has a mechanical automatic transmission, the engine control unit (engine con roll unit 9) and a transmission control unit (transmission control unit 10) and the vehicle start control system Ru with a speed-change The machine control unit (10) determines whether or not the vehicle could not start the previous time (S1) . If it is determined that the vehicle can not start the previous time , the engine control unit (10) increases the idle speed to a predetermined value (for example, 650 rpm). Information on fuel injection is transmitted to the control unit (9) (S4), and it is determined whether or not the engine idling speed has increased to a predetermined value (for example, 650 rpm) or more (S5). If the rotational speed has increased to a predetermined value (for example, 650 rpm) or more, start control is executed (S6), and the vehicle starts. It is characterized by having a determining whether made (S7) capabilities.

In the present invention, the transmission control unit (10) includes a clutch load comprising an engine torque measuring means (2), an engine speed detecting means (3), a transmission input shaft speed detecting means (4), and a timer (10T). It has a function to calculate the clutch load based on the measured value of the measuring means for measuring the vehicle, and to determine that it is impossible to start when the calculated clutch load exceeds a threshold value (the vehicle could not be started last time). Is preferred.

Here, the clutch load Q is defined as follows: engine torque is T, engine speed at the initial half clutch is Ne, and input shaft speed at the initial half clutch is Ni.
The following equation is obtained by integrating the time from the initial half-clutch to the time until the engine speed matches the input shaft speed.
That is,
dQ = ∫2πT / 60 (Ne-Ni) dt

In the present invention, the transmission control unit (10) measures the accelerator pedal opening by the accelerator opening detecting means (1) for measuring the accelerator opening, and the measured accelerator pedal opening is maximized. However, when the start is interrupted, it is preferable to have a function of determining that the start is impossible (the start was not made in the previous time).

  Alternatively, the transmission control unit (10) includes means (timer 10T) for measuring the time spent for starting, and the transmission control unit (10) has a threshold for time spent for starting. When the value exceeds the value, it is determined that the vehicle is unable to start (the vehicle has not started before), and a control signal for increasing the idle speed (to a predetermined speed (for example, 650 rpm)) is sent to the engine control unit. It is preferable to have a function of starting the vehicle.

According to the present invention having the above-described configuration, when the transmission control unit (transmission control unit 10) determines that the vehicle is unable to start (when it is determined that the vehicle has not started in the previous time), the idle rotation speed is set to (the predetermined rotation). Since the engine control unit (9) transmits a control signal for increasing the number (for example, up to 650 rpm) to the engine control unit (9), the idle rotation of the engine during the start-up standby is increased, so that the vehicle can be easily started when starting again. Become.

Here, raising the idle rotation of the engine while waiting for starting may cause wear of the clutch plate.
However, in the present invention, only when the transmission control unit (transmission control unit 10) determines that the vehicle cannot start (when it is determined that the vehicle has not started before), that is, only when it is necessary to start the vehicle. Since the idling speed of the engine increases, wear of the clutch plate is suppressed.

1 is a block diagram showing a configuration of a vehicle start control system according to an embodiment of the present invention. It is the flowchart which showed the start control method which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings (FIGS. 1 and 2).
In FIG. 1, the start control system generally indicated by reference numeral 100 includes an engine control unit 9 and a transmission control unit (hereinafter referred to as “control unit”) 10.
Further, the start control system 100 includes an accelerator opening detecting means (hereinafter referred to as “accelerator opening sensor”) 1, an engine torque detecting means 2, an engine speed detecting means 3, and a transmission input shaft speed detecting means. (Hereinafter referred to as “input shaft rotation sensor”) 4 , vehicle speed detection means 5, clutch stroke detection means 6, gear position detection means 7, brake signal detection means 8, clutch actuator 11, and display unit 12 And.

The control unit 10 includes a clutch control unit 10C and a timer 10T.
Then, the control unit 10 determines whether or not it is impossible to start, that is, whether or not it was not possible to start the last time, and if it is determined that it is impossible to start (when it is determined that the start could not be started last time) Information on fuel injection is transmitted to the engine control unit 9 so as to increase the idle speed (to a predetermined speed (for example, 650 rpm)) , and then the idle speed of the engine increases to a predetermined value or more. If the engine idling speed is higher than a predetermined value, the start control is executed, and it is further determined whether or not the vehicle has been started (S7).
Here, the numerical value of 650 rpm is an example, and is a numerical value that should be appropriately set according to the type and specification of the vehicle or engine.

Alternatively, the control unit 10 measures the clutch load comprising the engine torque measuring means (2), the engine speed detecting means (3), the transmission input shaft speed detecting means (4), and the timer (10T). The clutch load is calculated based on the value, and when the calculated clutch load exceeds the threshold value, it is determined that the vehicle cannot start (the vehicle has not started in the previous time), and the idle rotation speed is set to (predetermined rotation speed). A function of transmitting a control signal to the engine control unit 9 (up to 650 rpm, for example) may be added.

Here, the clutch load Q is defined as follows: engine torque is T, engine speed at the initial half clutch is Ne, and input shaft speed at the initial half clutch is Ni.
The following equation is obtained by integrating the time from the initial half-clutch to the time until the engine speed matches the input shaft speed.
That is,
Q = ∫2πT / 60 (Ne-Ni) dt

Further, the control unit 10 determines from the information from the accelerator opening sensor 1 that when the accelerator pedal opening is maximized but the start is interrupted, the start is impossible (the start was not made in the previous time). Thus, it is preferable to have a function of transmitting a control signal to the engine control unit (9) to increase the idle speed (to a predetermined speed (for example, 650 rpm)).

Alternatively, the control unit 10 determines that it is impossible to start when the time spent on starting exceeds the threshold value based on the timing information of the timer 10T (it was not able to start before) and It is preferable to have a function of transmitting a control signal to the engine control unit 9 to increase the rotational speed (to a predetermined rotational speed (for example, 650 rpm)).

Next, a vehicle start control method will be described based on the flowchart of FIG. 2 and also with reference to FIG.
In step S1 of FIG. 2, the control unit 10 determines whether or not the vehicle has failed to start .
At that time, it is determined that the vehicle cannot be started under the same conditions as the previous time (the clutch load is equal to or greater than the previous time, the accelerator opening is fully opened, and the elapsed time until the clutch meet is the same).

If the vehicle cannot start (YES in step S1), the process proceeds to step S2. If the vehicle can start (NO in step S1), the process proceeds to step S8.
In step S2, the control unit 10 sets the start NG flag A to ON and proceeds to step S3.

In step S3, the control unit 10 determines whether or not the flag A is ON.
If the flag A is ON (step S3 is YES), the process proceeds to step S4, and if the flag A is not ON (step 3 is NO), the process proceeds to step S6.
In step S4, the control unit 10 transmits information related to fuel injection to the engine control unit 9 in order to increase the idle speed to a predetermined value.

  In step S5, the control unit 10 determines whether or not the engine idle speed has increased to a predetermined value (for example, 650 rpm) or more. If the idle speed of the engine has not risen above the predetermined value (NO in step S5), the process returns to step S4 and repeats step S4 and subsequent steps. On the other hand, if the engine idling speed has increased to a predetermined value or more (YES in step S5), start control is executed (step S6), and the process proceeds to step S7.

In step S7, the control unit 10 determines whether or not the vehicle has started.
Here, as described above, as to whether or not the vehicle has started, whether or not the clutch load exceeds a threshold value, or whether or not the start is interrupted even though the accelerator opening is fully open, Alternatively, it is possible to adopt whether or not the time spent for starting by the timer timing exceeds a threshold value.
If the vehicle cannot start (NO in step S7), the process returns to step S3 and repeats step S3 and subsequent steps. On the other hand, if the vehicle has started (YES in step S7), the process proceeds to step S8, and the start NG flag A is switched OFF. And it returns to step S1, and repeats after step S1 again.

According to the illustrated embodiment, when the transmission control unit 10 determines that the vehicle is unable to start (when it is determined that the vehicle has not started before), the idle rotational speed is increased (to a predetermined rotational speed (for example, 650 rpm)). since transmits a control signal indicating that the engine control unit 9, the idle rotation of the engine is increased during the start waiting, in case of starting again, the start of the vehicle is facilitated.

Here, raising the idle rotation of the engine while waiting for starting may cause wear of the clutch plate.
However, in the illustrated embodiment, the engine idle rotation is performed only when the transmission control unit 10 determines that the vehicle cannot start (when it is determined that the vehicle has not started before), that is, only when it is necessary to start the vehicle. As a result, the wear of the clutch plate is suppressed.

  The illustrated embodiment is merely an example, and is not intended to limit the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Accelerator opening degree detection means / Accelerator opening degree sensor 3 ... Engine rotation speed detection means / Engine rotation sensor 4 ... Transmission input shaft rotation speed detection means / Input shaft rotation sensor 6 ... Clutch stroke detection Means 9 ... Engine control unit 10 ... Transmission control unit / control unit 10T ... Timer 11 ... Clutch actuator

Claims (4)

In a vehicle start control system having a mechanical automatic transmission and including an engine control unit (9) and a transmission control unit (10), whether or not the transmission control unit (10) has failed to start last time. (S1), if it is determined that the vehicle cannot be started last time, information on fuel injection is transmitted to the engine control unit (9) so as to increase the idle speed to a predetermined value (S4). It is determined whether or not the engine idling speed has increased above a predetermined value (S5), and if the engine idling speed has increased above a predetermined value, start control is executed (S6), and the vehicle can be started. A vehicle start control system having a function of determining whether or not (S7) . The transmission control unit (10) measures a clutch load comprising an engine torque measuring means (2), an engine speed detecting means (3), a transmission input shaft speed detecting means (4), and a timer (10T). 2. The vehicle start control system according to claim 1, wherein the vehicle start control system has a function of calculating a clutch load based on a measured value of the means and determining that the start is impossible when the calculated clutch load exceeds a threshold value. The accelerator pedal opening degree is measured by the accelerator opening degree detecting means (1) for measuring the accelerator opening degree, and the transmission control unit (10) stops the start although the measured accelerator pedal opening degree is maximized. The vehicle start control system according to claim 1, wherein the vehicle start control system has a function of determining that the vehicle cannot start.   The transmission control unit (10) is provided with means (10T) for measuring the time spent for starting, and the transmission control unit (10) has a threshold for measuring the time spent for starting. The vehicle start control system according to claim 1, wherein the vehicle start control system has a function of determining that the vehicle cannot start when the value is exceeded.

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