JPH0532079U - Lock device for shift lever for automatic transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shift lever locking device for an automatic transmission, in which the shift lever can be locked in a neutral position. [Structure] When the driver leaves the vehicle while the shift lever is shifted to the neutral position in the idling state, the lock signal output control circuit D outputs a lock signal to operate the shift lock solenoid 6 to shift to the neutral position. Lock the lever.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lock device for a shift lever of an automatic transmission.

[0002]

[Prior Art]

 The shift lock system of the shift lever for an automatic transmission is intended to prevent accidents due to a sudden start of a vehicle equipped with an automatic transmission, and has the following two functions. (1) Shift lock mechanism The shift lever cannot be operated from the parking position unless the brake is pressed when starting. (2) Key interlock mechanism The ignition key cannot be removed unless the shift lever is shifted to the parking position.

[0003]

[Problems to be solved by the device]

 However, the shift lock system is a driver-priority system that prevents the driver from making an operation error. For this reason, if the car leaves the car while the shift lever is in the neutral position while idling, a passenger (especially a child) accidentally touches the shift lever and shifts, causing the car to start without a driver. There is a point. It is an object of the present invention to provide a shift lever locking device for an automatic transmission, which locks the shift lever in a neutral position when the driver leaves the vehicle in an idling state.

[0004]

[Means for Solving the Problems]

 As a concrete means for achieving the above-mentioned object, it is composed of a shift lever neutral position detection circuit, a driver seating determination circuit, a lock signal output control circuit, and a shift lock solenoid. When the detection circuit detects that the shift lever is shifted to the neutral position and the driver seating determination circuit determines that the driver is not seated in the driver's seat, the lock signal output control circuit There is provided a shift lever locking device for an automatic transmission, characterized in that the shift lock solenoid is actuated by a lock signal output by the lock lever to lock the shift lever in the neutral position.

[0005]

[Action]

 According to the automatic transmission shift lever locking device, when the driver leaves the vehicle while the shift lever is in the neutral position while idling, the lock signal output control circuit outputs the lock signal and shifts the shift signal. Activate the lock solenoid to lock the shift lever in the neutral position.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system circuit diagram of a lock device for a shift lever for an automatic transmission according to the present invention. The system circuit includes a constant voltage power supply circuit A, a door open / closed state detection circuit B, a driver seating determination circuit C, a lock signal output control circuit D, a shift lock solenoid drive circuit E, a shift lock release circuit F, and a driver walkthrough. It is composed of a corresponding circuit G. An ignition switch circuit 2 including an ignition switch 1 and a courtesy switch circuit 5 including a room lamp 3 and a courtesy switch 4 are connected in parallel to the battery BATT. Further, the ignition switch circuit 2 is connected to the shift lock solenoid 6 and the constant voltage power supply circuit A.

The constant voltage power supply circuit A includes a diode D ₁ for preventing reverse connection of a power supply, a resistor R for shaping an input waveform affected by ripples due to power generation of an alternator, induction noise due to other electric components, and the like. ₁ , capacitor C ₁ , C ₂ , Zener diode ZD ₁ for protection when surge voltage is applied, three-terminal regulator 7, capacitor C ₃ for smoothing output voltage, and prevention of damage to three-terminal regulator 7 due to short circuit It consists of a diode D ₂ .

The door open / closed state detection circuit B is connected between the room lamp 3 and the courtesy switch 4 of the courtesy switch circuit 5, and includes a Schmitt inverter S ₁ , resistors R ₁ , R ₂ , a capacitor C ₄ and a diode D ₃ . Composed of. The circuit B detects the open / closed state of the door after removing the mechanical chattering caused by turning the cartesis switch 4 on and off.

The driver seating determination circuit C is composed of two-stage connected Schmitt inverters S ₂ and S ₃ , resistors R ₄ and R ₅ , a capacitor C ₅ and diodes D ₄ and D _5, and is stored in the seat. The pressure sensitive switch 8 is connected. The diodes D ₄ and D ₅ absorb the surge caused by the inductive noise to the connection line of the pressure sensing switch 8 with built-in seat.

The lock signal output control circuit D includes NAND gates (hereinafter simply referred to as gates) G ₁ and G ₂ connected in two stages. The output of the Schmitt inverter S ₁ of the door open / closed state detection circuit B, the output of the Schmitt inverter S ₃ of the driver seating determination circuit C and the shift lever neutral are connected to the three input terminals of the first-stage gate G _1. The detection signal of the position detection circuit 9 is input. The three input terminals of the second-stage gate G ₂ are connected to the output of the gate G ₁ by a circuit having a resistor R ₆ and a capacitor C _6, and to the gate G by a circuit having a summit inverter S _4. The output of ₁ and the inverted output of the Q output of the flip-flop circuit FF ₁ forming the shift lock solenoid drive circuit E described later are input. The shift lever neutral position detection circuit 9 is specifically provided with a limit switch that operates corresponding to the shift lever that is shifted to the neutral position, or at the shift position displayed on the instrument panel. Correspondingly, a circuit or the like for emitting a signal is provided.

The shift lock solenoid drive circuit E comprises a flip-flop circuit FF ₁ and a switching transistor TR, and the output of the gate G ₂ of the lock signal output control circuit D is connected to the CK input terminal of the flip-flop circuit FF _1. The Q output terminal is input and connected to the base of the switching transistor TR 1 by a circuit including a diode D ₆ and a resistor R ₇ . Then, the shift lock solenoid 6 is connected to the collector of the switching transistor TR.

The shift lock release circuit F includes a gate G connected in two stages.₃, G_FourThree Schmid inverter S_Five, S₆, S₇, Resistance R₈, R₉And capacitor C₇, C₈It consists of Gate G₃Of one of the two input terminals of the door open / closed state detection circuit B₁Output of Schmitt inverter S_FiveIs input by the circuit through which the Schmidt inverter S of the driver seating determination circuit C is provided.₂Output is input. Second stage gate G_FourThe three input terminals of₈And capacitor C₇The gate G is formed by a circuit having₃Output and Schmitt inverter S ₆ Gate G₃Output and the flip-flop circuit FF₁Inverted output of Q output of resistor R₉, Capacitor C₈, Schmitt inverter S₇It is respectively input by the circuit via. And the gate G_FourOutput is the flip-flop circuit FF₁Is input to the clear input terminal C of.

The driver's walk-through compatible circuit G includes a timer IC 10, a shift register 11 including _three flip-flop circuits FF ₂ , FF ₃ and FF ₄ , gates G ₅ , G ₆ and two stages connected to each other. It is composed of a flip-flop circuit FF ₅ . The timer IC10 generates a clock pulse as a reference for detecting the elapsed time, and has a terminal of ~. A constant voltage power supply V _DD is supplied to the terminals. A constant voltage power supply V _DD is connected to a timer IC power supply circuit 12 in which resistors R ₁₀ and R ₁₁ and a capacitor C ₉ are interposed in series, and between the resistors R ₁₀ and R ₁₁ of the circuit 12. The terminal is connected. Further, the resistor R ₁₁ and the capacitor C ₉ are connected to each other and to the terminal. The output of the Schmitt inverter S ₃ of the driver seating determination circuit C is input to a terminal which is a reset terminal by a circuit including a resistor R ₁₂ and a capacitor C ₁₁ . The terminal which is the output terminal is connected to the CK terminal of the flip-flop circuit FF ₂ forming the shift register 11 via the Schmitt inverter S ₈ .

The Q outputs of the flip-flop circuits FF ₃ and FF ₄ forming the shift register 11 are respectively input to the three input terminals of the first-stage gate G ₅ , and the other one is the shift lever. The detection signal of the neutral position detection circuit 9 is input. The three input terminals of the gate G ₆ of the second stage, the resistor R ₁₃ and an output of the gate G ₅ by the circuit is interposed a capacitor C _12, more gate G ₅ to the circuit interposed Schmitt inverter S ₉ And the inverted output of the Q output of the flip-flop circuit FF ₅ are respectively input by a circuit having a resistor R ₁₄ and a capacitor C ₁₃ . The circuit is connected to each clear terminal C of each flip-flop circuit FF ₂ , FF ₃ , FF ₄ of the shift register 11. The output of the gate G ₆ is input to the CK terminal of the flip-flop circuit F F ₅ .

The Q output terminal of the flip-flop circuit FF ₅ is connected to the base of the switching transistor TR by a circuit including a diode D ₇ and a resistor R ₁₅ . Then, the output of the Schmitt inverter S ₃ of the driver seating determination circuit C is input to the clear terminal C by a circuit including a resistor R ₁₂ and a capacitor C ₁₁ .

The operation of the lock device for the shift lever for the automatic transmission having the above structure will be described below. When the vehicle is seated in the driver's seat and the ignition switch 1 is turned on, the constant voltage power circuit A supplies the power voltage V _DD to the door open / closed state detection circuit B, the driver seating determination circuit C, the lock signal output control circuit D, and the shift lock. It is supplied to the flip-flop circuit FF ₁ of the sonoid drive circuit E, the shift lock release circuit F, and the timer IC 10, the shift solenoid 11, and the flip-flop circuit FF ₅ of the driver's walkthrough correspondence circuit G 1. In the door open / closed state detection circuit B, when the capacitor C ₄ is charged through the resistor R ₂ and the input voltage of the Schmitt inverter S ₁ becomes equal to or higher than the predetermined voltage, the output voltage of the Schmitt inverter S ₁ falls. ..

When the door is opened, the courtesy switch 4 is turned on after a momentary chattering, and the electric charge of the capacitor C ₄ is discharged through the resistor R ₃ and the diode D ₃ . When the input voltage of the Schmitt inverter S ₁ is lowered below the predetermined voltage, the output voltage of the Schmitt inverter S ₁ is inputted rise, to the gate G ₁ of the first stage of the lock signal output control circuit D. Next, when the door is closed and the courtesy switch 4 is turned off after a momentary chattering, the voltage of the courtesy switch circuit 5 battery BATT is applied. For this reason, the capacitor C ₄ via the resistor R ₂ is charging, the input voltage of the Schmitt inverter S ₁ is equal to or higher than a predetermined voltage, falling output voltage of the Schmitt inverter S ₁ is, to the gate G ₁ Turn off the output. As described above, after the mechanical chattering of the courtesy switch 4 is eliminated, the opening / closing of the door can be detected.

In the driver seating determination circuit C, the seat built-in pressure sensitive switch 8 is turned on when the driver is seated in the driver's seat, and further, the ignition switch 1 is turned on. _DD Is supplied. Next, when the driver stands up, the pressure sensor 8 with built-in seat turns off after mechanical chattering and the resistance R_FourThrough the capacitor C_FiveIs charged and time constant R_Four・ C_FiveAfter the lapse of the time set by, the Schmitt inverter S₂As the input voltage to the Schmitt inverter S rises above the specified voltage and the output voltage falls.₃Output voltage rises. After that, when the driver sits in the driver's seat, the pressure sensor 8 with built-in seat turns on after mechanical chattering, and the capacitor C_FiveThe electric charge charged in the_Five Is discharged through the time constant R_Five・ C_FiveAfter the time set by, the Schmidt inverter S₂The input voltage to the Schmitt inverter S drops below the specified voltage.₃Output voltage falls. As described above, after the mechanical chattering of the pressure sensor 8 with built-in seat is eliminated, it is possible to determine whether the driver is seated in the driver's seat.

In the lock signal output control circuit D, the first-stage gate G₁To the three input terminals of the Schmitt inverter S of the door open / closed state detection circuit B.₁Output and the Schmidt inverter S of the driver seating discrimination circuit C.₃And the detection signal of the shift lever neutral position detection circuit 9. Therefore, when the driver opens the door with the door open and the shift lever is shifted to the neutral position, the gate G₁All three inputs become "H" level (the following level will be omitted) and the output will be "L" level (the following level will be omitted). At this time, the second-stage gate G ₂ Of all three input terminals of "H" and its output changes from "H" to "L", and the flip-flop circuit FF of the shift lock solenoid drive circuit E₁It is input to the CK terminal of.

However, one of the three input terminals of the gate G ₂ is “L” after a lapse of time set by the time constant R ₆ · C ₆ due to the circuit in which the resistor R ₆ and the capacitor C ₆ are interposed. Therefore, one is “H” due to the circuit with the Schmidt inverter S ₄ interposed, and the other one is the inverted output of the Q output of the flip-flop circuit FF ₁ that constitutes the shift lock solenoid drive circuit E. Since it becomes “L” after the time set by the constants R ₉ and C ₈ , the output of the gate G ₂ becomes “H” when either of the two inputs becoming “L” falls below a predetermined voltage, As a result, one pulse of “H” → “L” → “H” is generated.

Since the flip-flop circuit FF ₁ in the shift lock solenoid drive circuit E uses a JK flip-flop, it falls when the output of the gate G ₂ input to the CK terminal becomes “L”, The Q output becomes "H". This Q output is applied to the base of the switching transistor TR by a circuit having a diode D ₆ and a resistor R ₇ , and the shift lock solenoid 6 is activated by the conduction of the switching transistor TR to operate the shift lever. Lock in the neutral position.

First stage gate G of shift lock release circuit F₃To one of the two input terminals of the Schmitt inverter S of the door open / closed state detection circuit B for detecting the door closed state.₁"L" output of the Schmitt inverter S_FiveIs inverted to "H" and input to the other input terminal of the first-stage Schmitt inverter S of the driver seating determination circuit C when seated in the driver's seat.₂"H" output of is input, so gate G₃The output changes from "H" to "L". Second stage gate G_FourOf the three input terminals of the flip-flop circuit FF in the shift lock state.₁Inverted output of Q output of Schmitt inverter S₇Is inverted to "H" and input, and one is gate G₃Output is "L", resistance R₈And capacitor C₇The time constant R₈・ C₇ Becomes "L" after the lapse of time set by, and the other one is Schmitt inverter S _Four Since it is "H" due to the circuit through the gate, when the input which becomes "L" falls below a predetermined voltage, the gate G_FourOutput changes from “L” to “H”, and one pulse of “H” → “L” → “H” is generated by the flip-flop circuit FF.₁It is output to the clear terminal C of and the shift lock is reset.

When the driver stands up in the driver's seat, the timer IC 10 of the driver's walk-through support circuit G outputs a 1-second clock pulse by the output of the Schmidt inverter S ₃ of the driver seating determination circuit C, and the driver's seat The output of the clock pulse is stopped by seating on. The 1-second clock pulse is input to the CK terminal of the flip-flop circuit FF ₂ forming the shift register 11 via the Schmitt inverter S ₈ . The Q outputs of the flip-flop circuits FF ₃ and FF ₄ are both input to the first-stage gate G _5, and the detection signal of the shift lever neutral position detection circuit 9 is also input. Both the Q outputs of the flip-flops FF ₃ and FF ₄ become “H” when 5 seconds have elapsed since the clock pulse was input to the CK terminal of the flip-flop circuit FF ₂ (Fig. 2). if the shift lever is only to be shifted to the neutral position the output of the gate G ₅ becomes "L".

Therefore, the three input terminals of the second-stage gate G ₆ are all “H”, and the outputs thereof are changed from “H” to “L” and are input to the CK terminal of the flip-flop circuit FF _5. .. However, one of the three input terminals of the gate G ₆ becomes “L” after the lapse of the time set by the time constant R ₁₃ · C ₁₂ , due to the circuit in which the resistor R ₁₃ and the capacitor C ₁₂ are interposed, One is "H" due to the circuit with the Schmidt inverter S ₉ interposed, and the other one is the inverted output of the Q output of the flip-flop circuit FF ₅ , which is the time set by the time constant R ₁₄ · C _13. Since it becomes “L” after a lapse of time, the output of the gate G ₅ becomes “H” when any of the above-mentioned “L” inputs falls below a predetermined voltage, which causes “H” → “L” → “H”. One-shot pulse is generated.

Since the flip-flop circuit FF ₅ uses the JK flip-flop, the Q output becomes “H” at the fall when the output of the gate G ₆ input to the CK terminal becomes “L”. Become. This Q output is applied to the base of the switching transistor TR by a circuit including a diode D ₇ and a resistor R ₁₅ , and the shift lock solenoid 6 is actuated by the conduction of the switching transistor TR to move the shift lever to the neutral position. Lock with. The inverted output of the Q output of the flip-flop circuit FF ₅ which becomes “L” after the elapse of the time set by the time constants R ₁₄ and C ₁₃ is generated by each of the flip-flop circuits FF ₂ , FF ₃ and FF ₄ of the shift register 11. It is input to the clear terminal C and reset, and the inputs to the gate G ₅ both become "L".

When seated in the driver's seat, the output of the Schmidt inverter S ₃ of the driver seating determination circuit C becomes “L”, but the terminal which is the reset terminal of the timer IC 10 and the clear terminal of the flip-flop circuit FF ₅ . The input to C becomes "L" after a lapse of time set by the time constant R ₁₂ · C ₁₁ by the circuit having the resistor R ₁₂ and the capacitor C ₁₁ , and when the timer IC 10 and the flip-flop circuit FF ₅ are reset. At the same time, the shift lock for the shift lever is reset.

If the ignition switch 1 is turned on and the shift lever is left in the neutral position and the driver's seat is not left in the driver's seat for 5 seconds, Regardless of whether the driver's door is open or closed, it is judged as a walkthrough and the shift lever is locked in the neutral position. This lock is not reset until the driver is seated.

FIG. 3 is a timing chart showing the operation of the above embodiment. In this case, it is assumed that the shift lever has been shifted to the neutral position. .. In (1), the ignition switch 1 is turned on to enter the standby state. In (2), when the door is opened and the driver's seat is left, the flip-flop circuit FF _{1 of} the shift lock solenoid drive circuit E outputs the shift lock. In (3), when standing from the driver's seat, the timer IC 10 generates a 1-second clock pulse, and after 5 seconds has elapsed, the flip-flop circuit F F ₅ of the driver's walk-through corresponding circuit G outputs a shift lock signal. Since the shift lock has already been made in (2) above, the shift lock state does not change. At this time, the clock pulse is reset so that 6 seconds or longer is not detected. In (4), when the driver is seated in the driver's seat and the door is closed during the shift lock operation, the flip-flop circuit FF ₁ of the shift lock solenoid drive circuit E is reset and the shift lock is released.

The following (5) and (6) correspond to the movement of a person in the vehicle compartment. In (5), when the driver leaves the driver's seat, a 1-second clock pulse is generated, and if the driver does not sit in the driver's seat even after 5 seconds, it is judged that he / she has walked through or has exited from other than the driver's seat, and shifts Activate the lock. In (6), when the driver sits in the driver's seat, the flip-flop circuit FF ₅ of the walk-through corresponding circuit G is reset and the shift lock is released.

[0030]

[Effect of the device]

 The present invention has the above-described structure and operation, and when the driver leaves the vehicle while the shift lever is shifted to the neutral position in the idling state, the lock signal output control circuit outputs the lock signal, and the shift lock solenoid Since the shift lever is locked in the neutral position by operating the, it is possible to prevent the unexpected situation where a passenger accidentally touches the shift lever and shifts, and the vehicle starts without a driver. .

[Brief description of drawings]

FIG. 1 is a system circuit diagram of a lock device for a shift lever for an automatic transmission according to the present invention.

FIG. 2 is a timing chart showing the operation of the shift register.

FIG. 3 is a timing chart showing an operation of a lock device of a shift lever for an automatic transmission according to the present invention.

[Explanation of symbols]

6 ... Shift lock solenoid, 8 ... Seat built-in pressure switch, 9 ... Shift lever neutral position detection circuit, C ... Driver seating determination circuit, D ... Lock signal output control circuit.

Claims (1)

[Scope of utility model registration request] 1. A shift lever neutral position detection circuit, a driver seating determination circuit, a lock signal output control circuit, and a shift lock solenoid, wherein the neutral position detection circuit is shifted to a neutral position in an idling state. Is detected and the driver's seating determination circuit determines that the driver is not seated in the driver's seat, the shift lock solenoid is output by the lock signal output from the lock signal output control circuit. Is operated to lock the shift lever in the neutral position, the shift lever locking device for an automatic transmission.