JPH01253534A - Abnormality correcting device for throttle actuator - Google Patents

Abstract

PURPOSE:To slowly restore a throttle valve to secure its safety in the case where abnormality occurs by connecting a motor to drive the throttle valve with a reversible circuit, and providing a member to make the freely selective short-circuiting of both poles of the motor practicable. CONSTITUTION:When an ignition switch 15 is turned on, power source voltage is applied from a battery 14 to many transistors 10-13 to drive a motor 4 and a theoretical control section 9 to control each of the transistors 10-13, and a two circuit double throw-type relay 17 is simultaneously actuated for the connection of both poles of the motor 4 to each of the transistor 10-13. In this case, the theoretical control section 9 controls the motor 4 according to its operating state. On the other hand, when abnormality has been detected, the relay 17 is turned off to short-circuit both the poles of the motor 4. Thus the motor 4 is turned into a free state, and power generation is controlled to slowly open a throttle valve.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for dealing with a failure of a tandem throttle actuator having a motor-driven second throttle valve, and in particular, an abnormality countermeasure device suitable for a traction control system. It is.

[Conventional technology]

As shown in FIG. 1 of Japanese Patent Application Laid-Open No. 62-87630, the conventional device has only basic circuits such as normal rotation, reverse rotation, and stationary rotation for the DC motor that drives the throttle valve. There are various possible circuits for the motor drive section, but in this case, only relays are used. Such a circuit cannot provide a fail-safe against failure of the motor control section. However, in recent years, there has been a strong demand for improved safety in vehicle body control, and it is thought that countermeasures have been made to address these issues, but it is assumed that the circuit configuration shown in FIG. Now, referring to FIG. 3, the motor 4 is connected to the second throttle valve, and is driven by receiving signals from the logic control section with the switch 15 and relay 14 turned on. If an abnormality is determined in this state, the motor is freed by turning off the relay 14, and the throttle valve is returned by the spring. However, in this case, the structure did not take into account failures during traction control.

[Problem to be solved by the invention]

There are two failure modes for the second throttle valve: one is a failure in which it does not open, and the other is a failure in which it does not close. For the latter, it is not a problem if the first throttle valve is manually operated by a human, but the problem arises when the former does not open and the engine becomes uncontrollable. In this case, use a relay to turn the motor drive a power supply OF"Fl,... to free the motor and open the throttle valve with spring force.

If you simply turn off the relay as in the above conventional technology,
There is a problem with the throttle opening too early. If a failure occurs while controlling the drive torque on a low-friction road surface, such as with traction control, there is a possibility that humans will not be able to respond and the vehicle will exhibit extremely dangerous behavior.

The purpose of the present invention is to enable humans to adequately deal with such cases.

[Means to solve the problem]

The above purpose is not to turn off the motor drive power, but to short-circuit both poles of the motor with a two-circuit double-throw relay.
This is achieved by activating dynamic braking of the motor. As a result, the throttle valve opens slowly.

[Effect]

The motor, throttle valve, and return spring are connected.
When the throttle valve is opened by the return spring, the motor rotor also moves. At this time, by shorting both poles of the motor, dynamic braking occurs according to Fleming's right-hand rule and left-hand rule, and the throttle valve opens slowly.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 4.

First, the structure of the throttle body will be explained with reference to FIG. A first throttle valve 3 and a second throttle valve 2 are arranged in series in the throttle body 1, and the first throttle valve is connected to an accelerator pedal 8 operated by a human foot and a first return spring 7. There is.

In addition, the second throttle valve 2 is connected to the gear 5 to control the motor 4.
It is also connected to the second return spring 6. Next, one embodiment of the present invention will be described using FIG. The configuration includes a battery 16, an ignition 5W15, a motor 4, and transistors 10 and 1 that drive the motor.
1, 12, 13 and a logic control section 9 that controls the transistors.
, and a two-circuit double-throw relay 17 capable of shorting both poles of the motor. In operation, when the ignition 5W15 is turned on, the logic control unit 9,
Power is supplied to the transistor.

Furthermore, a two-circuit double-throw relay works, and both poles of the motor are connected to the transistor side. In this state, the motor is controlled by the logic control unit 9 depending on the operating state. For example, if transistors 12 and 11 are turned on to cause forward rotation, and transistors 10 and 10 are turned on to cause reverse rotation and then stopped, the transistors are turned on little by little in a direction that balances the return spring force.

If an abnormality is detected in this state, the two-circuit double-throw relay 17 is turned off to short-circuit both poles of the motor. The abnormality is detected by monitoring the opening degree of the second throttle, and is detected when there is no change in the opening degree with respect to the control signal, and causes include transistor failure, motor failure, etc. Regarding a failure of the logic control unit itself, there is no problem since the relay signal will naturally turn OFF. By shorting both poles of the motor, the motor itself becomes free and the second throttle valve attempts to open due to the force of the return spring, but the rotor of the motor connected to the throttle valve is also rotated. Therefore, the throttle valve opens slowly when the motor initiates power generation control. To briefly explain the principle of dynamic braking, when the rotor, which has a coil wound in the magnetic field B emitted from the motor's stator, which is a permanent magnet, attempts to return at a speed V due to the spring force, Fleming's right-hand rule states that the rotor A voltage e proportional to the speed V is generated at both poles of . Since the two poles are shorted here, the voltage e causes the rotor to receive a current i.
flows, and this time, according to Fleming's left-hand rule, a force f proportional to the current ■ is generated in the opposite direction to the speed V, which acts to stop the rotor.

Ideally, the rotor should not move based on the above principle, but in reality, the rotor moves slowly because of electrical loss. Therefore, the second throttle valve opens slowly. The effect of doing so will be explained using FIG. 4. During traction control, the second throttle valve is controlled so that the drive torque falls within a safe range according to road surface conditions. In the conventional characteristic (a), when the driver presses the accelerator too much and the drive torque exceeds the safe range, the second throttle valve is slightly closed to bring the drive torque into the safe range.
If a failure is detected, the second throttle valve returns to its original position due to the spring force in the jet, causing the drive torque to temporarily become too large and suddenly move out of the safe range. In response to this behavior, the driver would likely release the accelerator, but the situation would be extremely dangerous. In contrast, in characteristic (b) of the present invention, the second throttle returns slowly even after a failure is detected, allowing the driver to calmly operate the accelerator.

Slowly returning the throttle valve has the effect of reducing the i# impact torque on the throttle valve's spring, and since the transistor is separated from the motor as in this example, the influence of induced voltage on the circuit elements is also eliminated. It's also effective.

This embodiment is merely an example, and the same effect can be obtained by short-circuiting both poles of the motor 4 using one system of relays 18, as shown in FIG.

〔Effect of the invention〕

According to the present invention, even if a failure is detected during the 1-traction control l-roll, the second slot 1 health valve will slowly return to its original position due to the motor's dynamic braking, making it easy for humans to respond.
This has the effect of ensuring safety.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, FIG. 2 is a schematic diagram of the structure around the throttle body, FIG. 3 is a conventional circuit configuration diagram, and FIG. 4 is an explanatory diagram of the effects of the present invention. FIG. 5 is a circuit diagram of another embodiment of the present invention. 4...Motor, 9...Logic control unit, 17...2
Circuit double-throw relay. Figure 1 / Figure 2 Eshishi Figure 3 Figure 4 ((L) Assemble, Takee (b) Trend el "t cut today i" Resistance Figure 5 / Chi

Claims (1)

[Scope of Claims] 1. It is disposed in the intake passage of the engine and has the function of controlling the intake air amount of the engine at all times or for a limited period depending on the valve opening degree, and controls the valve opening degree. In the throttle actuator, the throttle actuator includes a motor for controlling the motor and a return member for returning the opening to a predetermined opening on the fully open side when control of the motor is stopped; An abnormality countermeasure device for a throttle actuator, characterized by having a member that can be freely selected to short-circuit both poles of a motor.