JPH0735772Y2 - Engine mount control device for roof detachable vehicle - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an engine mount control device in a vehicle such as an automobile, and particularly to an engine mount control in a roof detachable vehicle in which a roof of a vehicle body is detachable. Related to the device.

[Prior Art] When supporting the engine from the vehicle body, a so-called active engine mount device that changes the vibration absorption characteristics in response to a command from the outside is used, and vibration of the vehicle body under various operating conditions of the engine, In consideration of noise, etc., the vibration absorption characteristics of the active engine mount device are changed in accordance with control factors such as engine speed and engine load so that optimum vibration absorption performance can be obtained under various engine operating conditions. It has already been proposed to improve the riding comfort and quietness of the vehicle, as disclosed in, for example, JP-A-59-65640 and JP-A-62-180.
Nos. 129 and 63-35838.

[Problems to be Solved by the Invention] The vibration of the vehicle body and the noise inside the vehicle compartment under various operating conditions of the engine differ depending on the structure and shape of the vehicle body. Therefore, the vehicle body structure and the vehicle body shape do not change. In a vehicle such as a hardtop, the optimum engine mount characteristics for various operating conditions of the engine do not change during the use of the vehicle. However, in convertible and targa roofs, the roof detachable vehicle, in which the roof of the vehicle body can be detached,
The vibration characteristics of the vehicle body and the noise characteristics in the vehicle compartment under various operating conditions of the engine change depending on whether the roof is mounted on the vehicle body or not. In particular, the left-right vibration of the front roof header portion due to the torsional primary resonance of the vehicle body becomes more remarkable in the open roof than in the closed roof.

The reduction of the left-right vibration is reduced by increasing the spring constant of the engine mount device to match the resonance frequency of the engine mount device and the rigid body resonance frequency of the engine, and causing the engine mount device to act as a dynamic damper. However, there is a demand for lowering the spring constant of the engine mount device in order to reduce engine noise during the closed roof and muffled noise inside the vehicle that does not pose a problem during the open roof.

In view of the above-mentioned problems, the present invention makes it possible to obtain optimum engine mount characteristics for both the open roof and the closed roof, and to provide excellent riding comfort and quietness in any condition. An object of the present invention is to provide an engine mount control device for a roof detachable vehicle that can be obtained.

[Means for Solving the Problems] According to the present invention, the above object is to detect whether or not a roof is mounted in an engine mount control device in a vehicle in which the roof of the vehicle body is removable. When the roof mounting detection means detects the roof mounting, the engine mounting control is performed according to a predetermined closed roof control characteristic, and the roof mounting detection means does not detect the roof mounting. It is sometimes achieved by an engine mount control device having control means for performing engine mount control according to a predetermined open roof control characteristic.

[Operation and Effect of the Invention] According to the above-described configuration, the control characteristics of the engine mount are automatically adjusted to appropriate control characteristics under each condition when the roof is mounted on the vehicle body and when it is not. Will be switched to. As a result, with or without the roof mounted on the vehicle body, appropriate vibration absorption performance can be obtained for each of them, effectively reducing the vibration of the vehicle body and the noise in the vehicle interior, and under any condition. Also in this, excellent riding comfort and quietness can be obtained.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows one embodiment of an engine mount control device in a roof detachable vehicle according to the present invention. In the figure, reference numeral 10 denotes a vehicle body of a roof detachable vehicle to which the engine mount control device according to the present invention is applied, and a roof panel 12 of the vehicle is detachable from the vehicle body 10 to form a so-called targa roof. ing.

Further, in the figure, 20 indicates an engine mounted in the engine room of the vehicle body 10. The engine 20 is composed of a plurality of engine mount devices 24 and a plurality of transmission mount devices 26 together with a transmission 22 which is integrally connected to the engine 20. It is designed to be supported by the vehicle body 10.

The engine mount device 24 is configured by a so-called active engine mount device that changes its vibration absorption characteristics according to an external command, for example, an electric signal. As the engine mount device 24, an electrostrictive type as shown in JP-A-59-65640, a magnetic fluid filled type as shown in JP-A-62-180129, and Kaisho 63-358
It may be a fluid pressure control type as shown in Japanese Patent No. 385 or other known active engine mount device, which is adapted to change the vibration absorption characteristics by an electric signal from the electronic control device 30. There is.

The electronic control unit 30 includes a microcomputer of a general structure, receives information about the number of revolutions of the engine 20 from a revolution number sensor 32, and information about a throttle opening degree of the engine 20 from a throttle opening degree sensor 34. Ten
Information about whether or not the roof panel 10 is attached to the vehicle body 10 can be given from the roof switch 36 attached to the vehicle.

The roof switch 36 may be composed of a limit switch having a general structure, and is turned on when the roof panel 12 is attached to the vehicle body 10.
It is configured to be in an off state when the 12 is removed from the vehicle body 10.

The electronic control unit 30 determines the optimum control characteristics of the engine mount unit 24 determined in consideration of the vibration of the vehicle body under various operating conditions of the engine, the noise in the vehicle compartment, and the like by experiments, etc. The closed roof control characteristic and the roof panel 12 as the optimal characteristic when installed are the vehicle body.
Two open roof control characteristics are stored in advance as the optimum control characteristics when the roof switch 36 is in the on state, that is, when the roof switch 36 is in the on state, that is, Roof panel on car body 10
When 12 is attached, the closed roof control characteristic is selected as the optimum control characteristic, and the engine mount device 24 is controlled based on this, whereas when the roof switch 36 is not turned on, that is, the roof panel 12 is Car body 10
When it is further removed, the open roof control characteristic is selected as the optimum control characteristic, and the engine mount device 24 is controlled accordingly.

The engine mount device 24 may be controlled so that the spring constant is higher in the open roof than in the closed roof from the viewpoint of reducing lateral vibration of the front roof header portion.

FIG. 3 shows the left-right vibration level of the front roof header section at the time of the open roof. It will be understood from this graph that when the spring constant of the engine mount device is reduced in the open roof as compared with that in the closed roof, the lateral vibration level of the front roof header portion is reduced as compared with the case where it is not.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of an engine mount control device in a roof detachable vehicle according to the present invention,
FIG. 2 is a flow chart showing an example of a control procedure in the engine mount control device according to the present invention, and FIG. 3 is a graph showing a horizontal vibration level characteristic of the front roof header portion at the time of an open roof. 10 …… Body, 12 …… Roof panel, 20 …… Engine, 22…
… Transmission, 24 …… Engine mounting device, 26…
… Transmission mount device, 30 …… Electronic control device,
32 …… Revolution sensor, 34 …… Throttle opening sensor, 36…
… Roof switch,

Claims (1)

[Scope of utility model registration request] 1. An engine mount control device for a vehicle in which a roof of a vehicle body is attachable / detachable, and roof mounting detection means for detecting whether or not the roof is mounted, and mounting of the roof by the roof mounting detection means. Is detected, the engine mount control is performed according to a predetermined closed roof control characteristic, and when the roof mounting detection means does not detect the mounting of the roof, the engine mount control is controlled according to a predetermined open roof control characteristic. And an engine mount control device having a means.