JPH07113341B2 - Vehicle engine speed control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rotational speed control device for a vehicle, particularly an engine for a vehicle.

(Prior Art) Conventionally, the amount of depression of the accelerator pedal by the driver of the vehicle is
Input to the in-vehicle computer as a signal that indicates the driver's intention to control the engine speed, and at the same time, input signals to the computer that indicate the engine coolant temperature, intake air temperature, and other engine and vehicle operating conditions to optimally open the throttle valve. To operate the throttle valve drive actuator (eg, step motor, DC motor, etc.) based on the calculated output to control the opening of the throttle valve and control the engine speed. Is proposed.

(Problems to be Solved by the Invention) In the above-described conventional engine speed control device, when a failure occurs in an on-vehicle computer or an actuator for controlling a slot valve, and the throttle valve accidentally becomes inoperable in a state where the throttle valve is wide open. , Because the engine continues to rotate at high speed,
It is very dangerous for driving safety. In particular, if the throttle valve cannot be closed close to full opening, the engine continues to rotate in an over-rotation state, which causes serious damage in the end. As described above, the present invention has the advantage that, when the regular throttle valve opening control system becomes inoperable, the throttle valve can be forcibly driven in the closing direction by giving priority to the throttle valve control actuator. It is possible to secure the running safety of the vehicle and prevent damage to the engine, and even if it is installed in the engine room of the vehicle that is constantly exposed to dust, muddy water, etc., rust or stick It is an object of the present invention to provide an engine speed control device having a simple structure and a low cost, which does not occur and can reliably operate in the unlikely event that the throttle control actuator or the like fails.

(Means for Solving Problems) The present invention has been devised in view of the above, and is a throttle valve interposed in an intake passage of a vehicle engine and an accelerator pedal operatively connected to the throttle valve. In a rotational speed control device for a vehicle engine, which comprises a first actuator for controlling the opening of the throttle valve according to the depression amount of the brake pedal, the depression amount of the accelerator pedal is equal to or less than a set value, and the depression amount of the brake pedal is reduced. When the amount is equal to or more than a predetermined value, the opening of the throttle valve is limited to a predetermined opening or less, and the depression of the brake pedal is released,
The engine speed control device for a vehicle, comprising: a second actuator that releases the restriction when the accelerator pedal depression amount is equal to or greater than a set value, and the throttle valve has a predetermined opening degree. It is a gist of a rotation speed control device for a vehicle engine, which has a value corresponding to the vicinity of fast idle during low temperature operation.

EXAMPLES Examples of the present invention will be specifically described below with reference to the accompanying drawings. Reference numeral 10 in the drawing conceptually represents a vehicle engine, and the engine includes an intake passage 12 including an intake manifold. The intake passage 12 communicates with the atmosphere via a throttle valve 14 provided in the passage, a carburetor 16 and an air cleaner 18 which are conceptually schematically shown in the drawing. Above throttle valve 14
Has a pulley 20 secured to its valve stem 14 ', between the pulley 20 and a cooperating pulley 24 on a first actuator 22, which in this embodiment is shown as a step motor. Is wound. First actuator
22 receives a control signal from an in-vehicle computer (EPU) 28, and rotates in either forward or reverse direction, and rotates the throttle valve shaft 14 ′ via the pulleys 20 and 24 and the belt 26 to rotate the throttle valve 14 The opening degree of the throttle valve is increased or decreased or stopped to maintain the opening degree of the throttle valve at an arbitrary opening degree.

The computer 28 is based on a depression amount signal from an accelerator pedal depression amount sensor 32 that produces an output corresponding to the depression amount of an accelerator pedal 30 operated by a driver, and the basic signal is used as a driving condition of an engine and a vehicle. The above-mentioned first actuator
It outputs a control signal indicating the optimum throttle opening for 28. In the case of this embodiment, the correction element is a water temperature sensor that detects the cooling water temperature of the engine 10.
34 output signal, an output signal of a rotation speed sensor 36 that detects the rotation speed of the engine 10, an output signal of a temperature sensor 38 that detects the intake air temperature of the engine 10, an output signal of a speed sensor 40 that detects the traveling speed of the vehicle, Output signals of the forward shift speed sensor 42 and the reverse shift speed sensor 44, which indicate whether the shift speed of the transmission is selected to the low speed step, the high speed step, or the reverse step, are used. A signal indicating the driving state, for example, an altitude signal related to the intake air density at the traveling point, a signal indicating the humidity of the intake air, or the like can be used as the correction element, or conversely, a part of the correction signal can be omitted.

The valve shaft 14 'of the throttle valve 14 has a first lever 46
One end of the second lever 48 is fixed, and one end of the second lever 48 is pivotally attached to the free end of the other end of the lever. Further, a roller 50 is rotatably supported on the other end of the second lever 48, and the roller 50 is
It is fitted in a long hole 54 formed at one end of the third lever 52. The other end of the third lever 52 is connected to the output rod 60 of the second actuator 58 via the fourth lever 56. In the illustrated embodiment, the second actuator 58 is exemplified as a vacuum-actuated actuator, and the vacuum in the intake passage 12 is communicated with the working chamber through the solenoid valve 62.
64 and a diaphragm 66 as a movable partition that limits the working chamber, and the output rod 60 is connected to the diaphragm 66. A brake switch 70 closed by the driver depressing the brake pedal 68 and an accelerator pedal by the driver are included in the energizing circuit of the solenoid valve 62.
A relay switch 72 is provided which is opened by stepping on 30 for a set value or more (for example, 10% or more). The relay switch 72 is an accelerator which is closed by stepping the accelerator pedal 30 over the set value. Opening / closing control is performed by a solenoid 76 energized by a switch 74. In the figure, reference numeral 78 is a vehicle-mounted power source, for example, a battery.

In the above configuration, when the vehicle is normally traveling, the driver operates the accelerator pedal 30 to input a depression amount signal from the depression amount sensor 32 to the vehicle-mounted computer 28. In the computer 28, various sensors 34 representing the operating states of the engine and the vehicle at that time are based on the stepping amount signal.
Necessary calculation is performed based on the signals Nos. 44 to 44, and the corrected output signal is supplied to the first actuator 22. First
By the operation of the actuator 22, the throttle valve 14 is adjusted to an optimum opening degree via the pulleys 24 and 20, and the belt 26. On the other hand, when the accelerator pedal 30 is stepped on, the switch 74 is closed and the solenoid 76 is energized.
Solenoid valve 62 is de-energized because 72 is opened. solenoid valve
When the valve 62 is deenergized, the vacuum in the intake passage 12 of the engine 10 is introduced into the working chamber 64 of the second actuator 58, and the diaphragm 66 is in the position shown in the figure. In this state, as the throttle valve 14 is opened and closed, the first lever 46 fixed to the valve shaft 14 'of the throttle valve 14 is simultaneously rotated, so that the roller 50 on the second lever 48 is placed in the elongated hole 54 of the third lever 52. Although the hole 54 is displaced to the left and right, the same long hole 54 is preset to such a size that the throttle valve 14 can be freely opened and closed from fully closed to fully open, so that the opening / closing operation of the throttle valve 14 may be disturbed. There is no. Next, for some reason, the accelerator pedal depression amount sensor
32, the computer 28 or the first actuator 22 fails, the throttle valve 14 becomes uncontrollable, and stops at a certain opening degree, the driver controls the rotation speed of the engine 10 regardless of the operation of the accelerator pedal 30. Therefore, the fact of the failure should be recognized, and the brake pedal 68 should be depressed to stop the vehicle to check the occurrence of the failure. In such a case, of course, the accelerator pedal 30 is not depressed, so the switch 72 is closed.
Since the switch 70 is closed by the depression of the brake pedal 68, the solenoid valve 62 is energized. Since the vacuum introduced into the working chamber 64 of the second actuator 58 is interrupted by the biasing of the solenoid valve 62 and the atmosphere is introduced into the chamber, the diaphragm 66 moves right by the spring force, and the output rod 60, The third lever 52 is displaced leftward via the 4-lever 56 as indicated by the arrow in the figure. In the event of the above failure, the throttle valve 14
Is not so dangerous when the stick is locked or locked at a low opening, but as described above, when the stick or locked becomes inoperable at a large opening, especially near full opening, the engine 10 is operated at a high rotational speed. It is extremely dangerous as it continues. In such a case, by the left movement of the third lever 52, the right end of the elongated hole 54 engages with the roller 50,
Since the throttle valve 14 is forcibly driven in the closing direction via the lever 48 and the first lever 46, it is possible to reliably prevent the danger. Of course, for this purpose, the second actuator
The operation force of 58 is sufficiently large, and it is necessary to have a capacity for driving not only the throttle valve 14 but also the first actuator 22 which is connected to the valve via a belt and a pulley and is stopped. Further, when the throttle valve 14 is closed by the operation of the second actuator 58, it is dangerous if the engine 10 is suddenly stopped by fully closing the valve 10.
In order to secure the hydraulic pressure for power steering and the power assist of the brake device (often using the vacuum of the intake system of the engine as the power source), for example, the throttle valve equivalent to the fast idle at low temperature. It is preferable that the opening be maintained. Further in this case,
The response speed of the second actuator 58 is preferably configured so as not to affect the operation of the dashpot that is widely used from the viewpoint of exhaust gas performance. Specifically, it is operated by the biasing of the solenoid valve 62. When the atmosphere is introduced into the chamber 64, the operating speed of the diaphragm may be adjusted by a diaphragm or other means. As a result of the brake operation, when the vehicle stops and the driver stops operating the brake pedal 68, the switch 70 opens, so the solenoid valve 62 is deenergized again, and the second actuator 58 and the third lever connected thereto. The elongated holes 54 of 52 are returned to the original positions shown in the drawing, respectively, and the normal opening and closing of the throttle valve 14 is not hindered.

Further, the second actuator 58 and the first to fourth levers 46, 48, 52, 56 connecting the actuator and the throttle valve 14 are provided in the engine room of the vehicle which is constantly exposed to dust, muddy water, etc. during traveling. It is usually installed in the vehicle, but when the accelerator pedal 30 depression amount is less than or equal to a predetermined value and the brake pedal 68 depression amount is greater than or equal to a set value, the second
The actuator 58 operates to decrease the opening degree of the throttle valve 14, and the first to fourth levers 46, 48, 52 and 56 are operated.
When the brake pedal 68 is released or the accelerator pedal 30 is stepped over a preset value for driving the vehicle, or for coasting or acceleration, the second actuator 58 operates in the opposite direction to the first to Since the fourth levers 46, 48, 52 and 56 are driven in the opposite directions, the second actuator 58 and the first to fourth levers 46, 48, 52 are very frequently used while the vehicle is traveling.
And 56 will be reciprocally displaced, and even if exposed to dust or muddy water, they will not become inoperable due to sticking or rusting, and therefore reliably operate when the first actuator 22 or computer 28 which rarely occurs fails. There is an essential advantage to doing. Further, according to the configuration of the present invention, the common throttle valve 14 provided in the intake passage 12 is forcibly driven in the closing direction by the second actuator 58 in the emergency, so There is no need to additionally provide a separate emergency stop valve in the intake passage 12, and there is an advantage that the structure can be provided at a low cost.

In the above embodiment, the fuel is supplied to the engine 10 by the carburetor 16, but the present invention can be similarly applied to an engine having a fuel injection device. Although a step motor or a DC motor is illustrated as the first actuator 22, it goes without saying that a pressure responsive actuator, an electromagnetic actuator or the like can be arbitrarily adopted. Similarly, although a vacuum-actuated diaphragm type actuator is illustrated as the second actuator 58, it is obvious that a piston type actuator or an electric actuator may equally be adopted instead. In addition, the accelerator pedal 30 and the brake pedal 68 are often stepped on at the same time because of the driving technique, but in this case, the closing of the accelerator switch 74 urges the solenoid 76 to switch the switch.
Since 72 opens, the solenoid valve 62 is not energized,
Therefore, the second actuator 58 does not operate and the throttle valve
The problem that the opening movement of 14 is hindered does not occur. In addition, in the illustrated embodiment, the switch 72 interposed in the energizing circuit of the solenoid valve 62 is configured to be opened by depressing the accelerator pedal 30, but the first actuator such as the vehicle-mounted computer 28. When a monitor device for indicating the failure of the operation system of 22 is provided, the normally open switch 72 may be closed by the output of the monitor device.

(Effects of the Invention) As described in detail above, according to the vehicle engine speed control device of the present invention, the throttle valve provided in the intake passage of the vehicle engine and the throttle valve operatively operate. In a rotation speed control device for a vehicle engine, comprising a first actuator that is connected and that controls the opening degree of the throttle valve according to the depression amount of the accelerator pedal, the depression amount of the accelerator pedal is equal to or less than a set value, And when the depression amount of the brake pedal is a predetermined value or more, the opening amount of the throttle valve is limited to a predetermined opening amount or less, and the depression amount of the brake pedal is released, or the depression amount of the accelerator pedal is A second actuator for releasing the restriction when the value is equal to or more than a set value is provided, and the predetermined opening degree of the throttle valve is set to a value when the engine operates at a low temperature. A structure characterized by a value near the idle speed A simple and inexpensive structure makes it inoperable due to sticks and rust even if it is installed in the engine room that is constantly exposed to dust and muddy water while traveling The throttle valve is forcibly operated when the throttle valve becomes uncontrollable due to a failure of the first actuator that controls the opening of the throttle valve and its related members (computer, etc.), and the throttle valve is forcibly operated. Is advantageous in that it can be driven in the closing direction to ensure the safety of vehicle travel and prevent engine damage.

[Brief description of drawings]

 The accompanying drawings are schematic diagrams showing an embodiment of the present invention. 10 …… Vehicle engine, 46 …… First lever 12 …… Intake passage, 48 …… Second lever 14 …… Throttle valve, 52 …… Third lever 14 ′ …… Throttle valve shaft, 58 …… Third 2 Actuator 16 ... Vaporizer, 60 ... Actuator output rods 20 and 24 ... Pulley 22 ... First actuator, 62 ... Solenoid valve 26 ... Belt, 64 ... Working chamber 28 ... Computer, 70 ... … Brake switch 30 …… accelerator pedal, 74 …… accelerator switch 32 …… accelerator pedal depression amount sensor

Claims (2)

[Claims] 1. A throttle valve provided in an intake passage of a vehicle engine, and a first valve operatively connected to the throttle valve for controlling an opening degree of the throttle valve according to a depression amount of an accelerator pedal. In a vehicle engine speed control device including an actuator, when the accelerator pedal depression amount is equal to or less than a set value and the brake pedal depression amount is equal to or greater than a predetermined value, the throttle valve opening degree is opened to a predetermined value. And a second actuator for releasing the restriction when the brake pedal is released or the accelerator pedal is pressed more than a set value. Rotational speed control device for vehicle engine. 2. The engine speed control of a vehicle engine according to claim 1, wherein the predetermined opening of the throttle valve is a value corresponding to the vicinity of fast idle when the engine operates at a low temperature. apparatus.