JP5272483B2 - Power supply switching device and engine control device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply switching device used for vehicular engine control and an engine control apparatus having the same, capable of maintaining a driving state without stopping an engine upon failure in a microcomputer. <P>SOLUTION: Control means 26 controls engine stopping or driving with two signals from a determination means 23 formed of first input determination means 21 and second input determination means 22 and an input signal I2 from running detection means. Thus, even if either of the input determination means 21, 22 or the running detection means is failed, the engine can be maintained in a driving state. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a power supply switching device and an engine control device that are mainly used for vehicle engine control and the like.

  In recent years, an increasing number of vehicles are equipped with an engine control device capable of starting and stopping an engine by pressing a push button switch provided on an instrument panel of the vehicle.

  Here, a power supply switching device used for such vehicle engine control and the like and an engine control device using the same will be described with reference to FIGS. 4 and 5. FIG.

  FIG. 5 is a block diagram of a conventional power supply switching device. In FIG. 5, reference numeral 1 denotes a judging means composed of a microcomputer (hereinafter referred to as a microcomputer) and the like from an operating means (not shown) such as a push button switch. The operation signal I1 and the travel signal I2 from the travel detection means (not shown) for determining the position of the shift lever and the like are input signals.

  Reference numeral 2 denotes a driving means for driving an engine connected to the terminal P2 from a power source (not shown) connected to the terminal P1 by switching the connection between the terminals P1 and P2 according to an input signal from the determination means 1. Control means for determining whether or not to supply power to (not shown).

  The determination unit 1 and the control unit 2 constitute a power supply switching device 3.

  As shown in FIG. 4, the power supply switching device 3 configured as described above is disposed in an instrument panel or the like of the vehicle 6, and an operation means 7 such as a push button disposed on the instrument panel and a shift lever are provided. An engine control device 11 is configured by being connected to a driving detection means 8 for determining whether or not the vehicle is at a parking position, a power source 9, and a driving means 10 constituted by an electronic circuit or the like.

  If the engine is stopped when the driver operates the operating means 7 during parking, the engine is driven by supplying power to the driving means 10 from the power source 9, and conversely the engine is driven. For example, the engine is stopped by stopping the power supply from the power source 9 to the driving means 10.

  On the other hand, when the driver operates the operation means 7 while the vehicle is running, the power supply 9 supplies power to the drive means 10 only when the operation means 7 is continuously operated, such as pressing the pushbutton switch for a predetermined time. The supply is stopped and the engine is stopped.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-210000 A

  However, in the above-described conventional engine control device, the determination means 1 of the power supply switching device 3 is composed of a single microcomputer. Therefore, if the microcomputer fails due to static noise or the like, the operation means even if the vehicle is running Regardless of the presence or absence of the operation 7, there is a problem that the power supply to the driving means 10 by the power source 9 is stopped and the engine stops.

  The present invention solves such a conventional problem, and provides an engine control device in which even if a failure occurs in a microcomputer or the like constituting the determination means 1 during traveling, the engine does not stop due to the failure. It is intended to do.

  In order to achieve the above object, the present invention has the following configuration.

According to the first aspect of the present invention, the operation signal from the operation means and the travel signal from the travel detection means are input, and the signal from the determination means is input to drive or stop the engine of the vehicle. The determination means includes first and second input determination means for outputting an instruction signal for instructing driving or stopping of the engine, and the control means includes the first and second input means. Three AND circuits to which an instruction signal from the input determination means and the traveling signal are input, and a signal to be output is selected by a logical majority of these signals, and two different signals among the three signals are input. The power supply switching device is characterized by having a selection means composed of an OR circuit to which three signals output from the three AND circuits are input .

  Thereby, in order to determine the stop or drive of the engine from three or more input signals, even when one of the microcomputers constituting the determination means or the travel detection means fails, until the input by the operation means, It has the effect of providing a power switching device that does not stop the engine.

  The invention according to claim 2 is an engine control device comprising the power supply switching device according to claim 1, an operation means mounted on the vehicle, a travel detection means, a power source, and a drive means for driving the engine. The engine control device having a configuration suitable for use of the power supply switching device according to claim 1 can be provided.

  As described above, according to the present invention, even when one of the microcomputers constituting the control unit or the travel detection unit fails, it is possible to avoid the engine from being stopped until the input by the operation unit is performed. The effect that a power supply switching device and an engine control device using the same can be provided is obtained.

  Embodiments according to the present invention will be described below with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a block diagram of a power supply switching apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 21 denotes a first input determination means composed of a microcomputer or the like, and when a driver starts or stops an engine. On the basis of an operation signal I1 from an operation means (not shown) such as a pushbutton switch to be pressed and a travel signal I2 from a travel detection means (not shown) for detecting the position and travel speed of the shift lever, The operation is determined.

  Similarly to the first input determination means 21, 22 is a second input determination means constituted by a microcomputer or the like, which determines the operation of the operation means based on the operation signal I1 and the travel signal I2. And the determination means 23 is comprised from the 2nd input determination means 21 and 22.

  Reference numeral 24 denotes a selection unit composed of a logic circuit made of a semiconductor element such as a logic integrated circuit, which receives the instruction signals I11 and I12 and the running signal I2 input from the first and second input determination units 21 and 22. The

  Reference numeral 25 denotes a switching means composed of a semiconductor element such as a transistor, and a travel control means (not shown) for controlling the start or stop of the engine or the like connected to the terminal P12 based on the output signal O1 of the selection means 24. ) To determine whether power can be supplied from a power source (not shown) connected to the terminal P11.

  The selection means 24 and the switching means 25 constitute a control means 26, and the determination means 23 and the control means 26 constitute a power supply switching device 27.

  Here, an example of a logic circuit that realizes the function of the selection unit 24 will be described with reference to FIG. 2. In FIG. 2, reference numeral 42 denotes a signal input from the first and second input determination units 21 and 22. The AND circuit 41 is an AND circuit to which signals from the first input determination means 21 and the travel detection means 8 are input, and 43 is a signal from the second input determination means 22 and the travel detection means 8. AND circuit.

Reference numeral 44 denotes an OR circuit that receives signals from the AND circuits 41 to 43 and outputs signals to the switching means 25. The AND circuits 41 to 43 and the OR circuit 44 constitute the selection means 24.

  The AND circuit outputs “1” only when two input signals are “1”, otherwise outputs “0”. In the OR circuit, at least one of the three input signals is “1”. If there is, “1” is output, and “0” is output only when all are “0”.

  In the selection means 24 configured in this way, at least two of the instruction signals I11 and I12 from the first and second input determination means 21 and 22 and the travel signal I2 from the travel detection means 8 are “1”. "1" that instructs the switching means 25 to drive the engine is output as the output signal O1.

  A circuit based on majority logic that outputs “0” as an output signal O1 to the switching means 25 to stop the engine when at least two of the input signals I11, I12, and I2 are “0”. Composed.

  As shown in FIG. 4, the power supply switching device 27 configured as described above is disposed in an instrument panel or the like of the vehicle 6, an operation means 7 such as a push button switch disposed on the instrument panel, and a shift lever The engine control device 28 is configured by being connected to a driving detecting means 8 for determining a set position of the driving means 10, a power source 9, and a driving means 10 constituted by an electronic circuit or the like.

  The control performed by the power supply switching device 27 and the engine control device 28 in the above configuration will be described with reference to FIGS.

  Here, FIG. 3 shows a flowchart of the input determination processing of the first and second input determination means 21 and 22, where the first and second determination means 21 and 22 are similarly shown in FIG. When the engine is instructed to be driven, the instruction signal “1” is output. On the other hand, when the engine is instructed to stop, the instruction signal “0” is output.

  The traveling signal I2 is a signal “1” when it is determined that the vehicle is in a traveling state, and a signal “0” when it is determined that the vehicle is in a non-driving state.

  First, the power supply switching device 27 is initialized when power is supplied by connecting a battery or the like (S101), outputs “0” as an instruction signal, and detects whether the operating means 7 is operated (S102). To do.

  Next, when the operating means 7 is operated when the shift lever is in the “parking” position or in a non-traveling state such as when the vehicle is stopped, it is confirmed that the instruction signal is “0” which is a signal for instructing engine stop. (S103) Since the current output is “0”, “1”, which is a signal for instructing engine driving, is output (S104), and the instruction signal is maintained until the next operating means is operated (S102).

  In this case, in FIG. 1, the instruction signals I11 and I12 from the first and second input determining means 21 and 22 are both “1”, and at this time, the running signal I2 is “0”. "1" is output as the output signal O1 from the selection means 24 that operates by logic, and the switching means 25 is connected to the terminal P11 to the travel control means that controls starting or stopping of the engine or the like connected to the terminal P12. The engine is driven by supplying power from the power source.

  Next, a case will be described in which the operation means 7 is operated when the engine is driven in a non-traveling state, for example, when the vehicle is parked after moving to the destination.

  In FIG. 3, when the operating means 7 is operated (S102), since the current instruction signal output is “1” which is a signal for instructing engine driving (S103), the traveling signal I2 is “0”. After determining “0”, “0” is output as the instruction signal (S108), and the instruction signal is maintained until the next operation means is operated (S102).

  Here, in FIG. 1, the instruction signals I11 and I12 from the first and second input determination means 21 and 22 are both “0”, and at this time, the travel signal I2 is “0”. 24 outputs "0" as the output signal O1, and the switching means 25 supplies power from the power source connected to the terminal P11 to the travel control means for controlling the start or stop of the engine or the like connected to the terminal P12. The supply is cut off and the engine stops.

  Next, a description will be given of a case where the operating means 7 is operated, for example, when the engine is to be stopped while waiting for the vehicle to stop by a crossing or a signal.

  In this case, if the traveling signal I2 is detected from the speed of the vehicle, it is determined that the vehicle is not traveling and the engine can be stopped as described above. However, if the traveling signal I2 has detected the shift lever position, the shift lever Even if the vehicle is stopped, the driving signal is “1”, which is different from the above procedure.

  In this case, in FIG. 3, when the operating means 7 is operated (S102), the output of the current instruction signal is “1” which is a signal for instructing engine driving (S103). Although it is determined whether it is “0” indicating the running state (S105), since it is “1”, it is determined whether the operation of the operation means 7 continues for the specified time T1 or more (S107), and the operation is continuously performed. If so, the driver determines that the driver has operated with the intention of stopping, and outputs “0”, which is a signal for instructing to stop the engine (S108).

  If it is determined that the operation is not continuously performed (S106), the output "1" is maintained as the instruction signal, and the operation unit waits until the next operation means is operated (S102).

  Here, when the driver operates with an intention to stop, “0” is output as the instruction signals I11 and I12 from the first and second input determination means 21 and 22, so in FIG. Even if it is “1”, “0” is output as the output signal O1 from the selection means 24 operating according to the majority logic, and the engine is stopped.

  Next, a case where either the first input determination means 21 or the second input determination means 22 breaks down while the vehicle is traveling will be described. In this case, one of the instruction signals I11 and I12 is “1”. One of them can be “0”, but since the running signal I2 input to the selection means 24 is “1”, the output signal O1 from the selection means 24 is maintained at “1”, and the engine drive is maintained. It is possible to avoid stopping the engine while driving.

  Then, for example, after the vehicle is moved to the destination or the like, the traveling signal I2 from the traveling detection means 8 becomes “0” by making the vehicle non-traveling, and the instruction signals I11 and I12 input to the selection means 24 Since one is “1” and one is “0” and the running signal I2 is “0”, the output signal O1 from the selection means 24 is output “0” by the majority logic, and the engine is stopped. Can do.

  On the other hand, even if the travel detection means 8 breaks down while the vehicle is traveling and “0” is input to the selection means 24 as the travel signal, the instruction signals I11 and I12 input to the selection means 24 are both “1”. Therefore, the output signal O1 from the selection means 24 is maintained at “1”, the engine drive can be maintained, and it is possible to avoid stopping the engine during traveling.

  For example, after the vehicle is moved to the destination, the instruction signals I11 and I12 input to the selection unit 24 become “0” by continuously operating the operation unit 7 for a predetermined time T1 or more. Even if the running signal I2 input to the means 24 is "1", the output signal O1 from the selecting means 24 is output "0" by the majority logic, and the engine can be stopped.

  As described above, according to the present embodiment, even when one of the microcomputers constituting the control means or the travel detection means fails during traveling of the vehicle, the engine is stopped until the input by the operation means is performed. Accordingly, it is possible to provide a power supply switching device that does not perform the operation and an engine control device using the same.

  In the above description, the determination unit 23 is configured by the first and second input determination units 21 and 22. However, the present invention is not limited to this, and three or more input determination units 23 and 22 are included. The present invention can be implemented even if the determination unit 23 is configured by the input determination unit.

  The power supply switching device and the engine control device using the power switching device according to the present invention provide an engine until input by the operation means is performed even when one of the microcomputers constituting the control means during traveling or the traveling detection means fails. Is useful for an engine control device used mainly for engine control of a vehicle.

The block diagram of the power supply switching device by one embodiment of the present invention Logic circuit diagram of selection means Flow chart of input judgment processing Configuration diagram of engine controller Block diagram of a conventional power switching device

Explanation of symbols

DESCRIPTION OF SYMBOLS 7 Operation means 8 Travel detection means 9 Power supply 10 Drive means 21 First input determination means 22 Second input determination means 23 Determination means 24 Selection means 25 Switching means 26 Control means 27 Power supply switching device 28 Engine control devices 41, 42, 43 AND circuit 44 OR circuit

Claims (2)

The determination means includes an operation signal from the operation means and a travel signal from the travel detection means, and a control means that receives the signal from the determination means and drives or stops the engine of the vehicle. First and second input determining means for outputting an instruction signal for instructing driving or stopping of the engine, and the control means includes the instruction signal from the first and second input determining means and the traveling signal. Are selected and a signal to be output is selected by the logic majority of these signals, and three AND circuits to which two different signals among the above three signals are respectively input, and three output from the three AND circuits A power supply switching device comprising a selection means comprising an OR circuit to which a signal is inputted . An engine control device comprising: the power supply switching device according to claim 1; an operation means mounted on the vehicle; a travel detection means; a power supply; and a drive means for driving the engine.

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