JPH0893513A - Braking force controller for compression pressure releasing type brake - Google Patents
Braking force controller for compression pressure releasing type brakeInfo
- Publication number
- JPH0893513A JPH0893513A JP22972594A JP22972594A JPH0893513A JP H0893513 A JPH0893513 A JP H0893513A JP 22972594 A JP22972594 A JP 22972594A JP 22972594 A JP22972594 A JP 22972594A JP H0893513 A JPH0893513 A JP H0893513A
- Authority
- JP
- Japan
- Prior art keywords
- brake
- compression pressure
- type brake
- pressure release
- braking force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、圧縮圧開放式ブレーキ
の制動力制御装置に関し、特に、排気ブレーキ併用時の
制動力の制御技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking force control device for a compression pressure release type brake, and more particularly to a braking force control technique when used in combination with an exhaust brake.
【０００２】[0002]
【従来の技術】近年、高速道路の発達等に伴い、エンジ
ンの高出力化が進んでおり、それに見合った車両の制動
能力強化が必要になってきている。そして、特に、車両
総重量の大きなトラック、バス等の場合、主ブレーキ
（フットブレーキ）の容量増大には限度があり、主ブレ
ーキと併用する補助ブレーキの性能向上が重要となる。2. Description of the Related Art In recent years, with the development of highways and the like, the output of engines has been increasing, and it has become necessary to strengthen the braking capacity of vehicles to match them. In particular, in the case of trucks, buses, etc. having a large total vehicle weight, there is a limit to the capacity increase of the main brake (foot brake), and it is important to improve the performance of the auxiliary brake used together with the main brake.
【０００３】主ブレーキと併用する補助ブレーキとし
て、エンジンブレーキ効果を利用するものがあり、その
一般的なものとして、排気通路に設けたバタフライ式の
シャッタを閉塞し排気を閉じ込めることにより、背圧を
上昇させて制動力を発生する排気ブレーキがある。ま
た、前記排気ブレーキ以上の制動力を発生するものとし
て、エンジン圧縮行程でシリンダ内の圧力を逃がすこと
で制動力を発生させる圧縮圧開放式ブレーキがある（例
えば特開平４−３４４１１号公報参照）。As an auxiliary brake used in combination with the main brake, there is a brake utilizing the engine braking effect. As a general brake, a butterfly type shutter provided in an exhaust passage is closed to trap exhaust gas, thereby reducing back pressure. There is an exhaust brake that raises to generate braking force. Further, as a device that generates a braking force equal to or more than the exhaust brake, there is a compression pressure release type brake that generates a braking force by releasing the pressure in the cylinder in the engine compression stroke (see, for example, Japanese Patent Application Laid-Open No. 4-34411). .
【０００４】この圧縮圧開放式ブレーキは、エンジン圧
縮行程の上死点近傍で、排気弁又は専用に設けた弁を開
弁させてシリンダ内の圧力を逃がし、次の膨張行程にお
けるピストンを押し下げるエネルギを減少させること
で、圧縮損失を利用して制動力を発生させるものであ
る。従って、このブレーキは、シリンダ内の空気量によ
り制動力が左右され、空気量が多いほど、圧力開放によ
る圧縮損失が大となり、制動力が大きくなる。This compression pressure release brake opens the exhaust valve or a dedicated valve near the top dead center of the engine compression stroke to release the pressure in the cylinder and to depress the piston in the next expansion stroke. The braking force is generated by utilizing the compression loss. Therefore, the braking force of this brake depends on the amount of air in the cylinder, and the larger the amount of air, the greater the compression loss due to pressure release and the greater the braking force.
【０００５】[0005]
【発明が解決しようとする課題】ところが、従来、排気
ブレーキと圧縮圧開放式ブレーキの併用時には、圧縮圧
開放式ブレーキの制動能力を十分に発揮することができ
なかった。即ち、自然給気式のエンジンでは、排気ブレ
ーキ作動時のこもり音低減対策として吸気通路に吸気絞
り弁を設け、排気ブレーキの駆動アクチュエータと吸気
絞り弁の駆動アクチュエータを直列接続して排気ブレー
キの作動スイッチを投入することで、排気ブレーキの作
動に同期して吸気絞り弁が閉弁駆動する構成になってい
る。However, conventionally, when the exhaust brake and the compression pressure release type brake were used together, the braking ability of the compression pressure release type brake could not be sufficiently exhibited. That is, in a naturally air-supplied engine, an intake throttle valve is provided in the intake passage as a measure to reduce muffled noise when the exhaust brake is activated, and the exhaust brake drive actuator and the intake throttle valve drive actuator are connected in series to operate the exhaust brake. When the switch is turned on, the intake throttle valve is closed and driven in synchronization with the operation of the exhaust brake.
【０００６】このため、排気ブレーキ作動時に圧縮圧開
放式ブレーキを作動させた場合、吸気絞り弁が閉弁して
いることにより、シリンダ内に流入する空気量が減少す
るため、圧縮圧開放式ブレーキの制動力が本来の制動力
より低下してしまう。本発明は上記の事情に鑑みなされ
たもので、排気ブレーキ併用時の圧縮圧開放式ブレーキ
の制動力を向上できる圧縮圧開放式ブレーキの制動力制
御装置を提供することを目的とする。Therefore, when the compression pressure release type brake is operated at the time of operating the exhaust brake, the amount of air flowing into the cylinder is reduced because the intake throttle valve is closed. The braking force of is less than the original braking force. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a braking force control device for a compression pressure release type brake that can improve the braking force of the compression pressure release type brake when used in combination with an exhaust brake.
【０００７】[0007]
【課題を解決するための手段】このため、請求項１記載
の発明では、減速走行時に排気ブレーキ作動スイッチの
ＯＮ操作によって作動する排気ブレーキ及び該排気ブレ
ーキの作動に連動して吸気通路を閉塞する吸気絞り弁を
備えた車両に搭載され、減速走行時に圧縮圧開放式ブレ
ーキ作動スイッチのＯＮ操作によって作動する圧縮圧開
放式ブレーキの制動力制御装置であって、エンジン回転
速度検出手段と、排気ブレーキ作動時に前記圧縮圧開放
式ブレーキ作動スイッチのＯＮ信号が入力した時、前記
エンジン回転速度検出手段の検出値が所定値以下の時に
は前記吸気絞り弁を開弁制御する制御手段とを備えて構
成した。For this reason, according to the first aspect of the present invention, the exhaust brake which is operated by the ON operation of the exhaust brake operation switch during deceleration and the intake passage is closed in association with the operation of the exhaust brake. A braking force control device for a compression pressure release type brake, which is mounted on a vehicle equipped with an intake throttle valve and operates by turning on a compression pressure release type brake operation switch during deceleration travel, comprising an engine rotation speed detection means and an exhaust brake. When an ON signal of the compression pressure release type brake operation switch is input during operation, the control means for controlling the opening of the intake throttle valve when the detected value of the engine speed detecting means is below a predetermined value. .
【０００８】[0008]
【作用】請求項１記載の発明の構成において、車両の減
速走行時に排気ブレーキに加えて圧縮圧開放式ブレーキ
を使用する場合、圧縮圧開放式ブレーキの作動スイッチ
のＯＮ信号が入力した時、制御手段は、エンジン回転速
度検出手段からの検出値を判定し、エンジン回転速度が
所定値以下であった時は排気ブレーキの作動に連動して
閉塞される吸気絞り弁を開弁制御する。一方、エンジン
回転速度が所定値より高い場合には、吸気絞り弁をその
まま閉塞状態に維持する。According to the present invention, when the compression pressure release type brake is used in addition to the exhaust brake when the vehicle is decelerated, control is performed when an ON signal of the operation switch of the compression pressure release type brake is input. The means determines the detection value from the engine rotation speed detection means, and when the engine rotation speed is less than or equal to a predetermined value, controls the opening of the intake throttle valve that is closed in conjunction with the operation of the exhaust brake. On the other hand, when the engine speed is higher than the predetermined value, the intake throttle valve is maintained in the closed state as it is.
【０００９】これにより、排気ブレーキ併用時における
エンジン低速域での圧縮圧開放式ブレーキの制動力を従
来より高めることができる。尚、エンジン低速域では、
こもり音が小さいので騒音対策上大きな影響はない。ま
た、圧縮圧開放式ブレーキは、その構造上動弁系に高い
負荷がかかる虞れがあるが、エンジン高速域では吸気絞
り弁を閉塞状態に維持することで、圧縮圧開放式ブレー
キの動弁系に過大な負荷がかかることを防止できる。As a result, the braking force of the compression pressure release type brake in the engine low speed range when using the exhaust brake together can be increased more than before. In the low engine speed range,
Since the muffled noise is small, there is no significant impact on noise countermeasures. In addition, the compression pressure release type brake may have a high load on the valve system due to its structure, but by keeping the intake throttle valve closed in the high engine speed range, the compression pressure release type brake valve is operated. It is possible to prevent an excessive load from being applied to the system.
【００１０】[0010]
【実施例】以下、添付された図面を参照して本発明の一
実施例を説明する。図１は本発明の一実施例の構成を示
すブロック図である。図１において、アクセルスイッチ
１は、アクセルペダルが踏み込まれていない時にＯＮ信
号を発生し、踏み込まれた時にＯＦＦ信号を発生する。
クラッチスイッチ２は、クラッチペダルが踏み込まれて
いない時（クラッチ接続状態）にＯＮ信号を発生し、踏
み込まれた時（クラッチ断状態）にＯＦＦ信号を発生す
る。エンジン回転センサ３は、エンジン回転速度を検出
するもので、エンジン回転速度検出手段に相当する。排
気ブレーキ作動スイッチとしての排気ブレーキスイッチ
４及び圧縮圧開放式ブレーキ作動スイッチとしての圧縮
圧開放式ブレーキスイッチ５は、ドライバが手動操作で
きるようそれぞれ運転室内に設けられ、ＯＮ操作するこ
とで、それぞれ排気ブレーキ、圧縮圧開放式ブレーキの
作動信号を発生する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, an accelerator switch 1 generates an ON signal when the accelerator pedal is not depressed and an OFF signal when the accelerator pedal is depressed.
The clutch switch 2 generates an ON signal when the clutch pedal is not depressed (clutch engaged state) and an OFF signal when the clutch pedal is depressed (clutch disengaged state). The engine rotation sensor 3 detects the engine rotation speed, and corresponds to an engine rotation speed detection means. The exhaust brake switch 4 as an exhaust brake operation switch and the compression pressure release type brake switch 5 as a compression pressure release type brake operation switch are respectively provided in the driver's cab so that the driver can manually operate them, and when they are turned on, they are respectively exhausted. Brake and compression pressure release type brake operation signals are generated.
【００１１】コントロールユニット６は、上述した各ス
イッチ及びセンサからの信号を入力して、排気通路に介
装した排気シャッタを駆動する排気ブレーキアクチュエ
ータ７、エンジンの圧縮上死点近傍で排気弁又は専用の
弁を開弁駆動する圧縮圧開放式ブレーキアクチュエータ
８及び吸気通路に介装した吸気絞り弁を駆動する吸気絞
り弁アクチュエータ９を、それぞれ駆動制御するもので
ある。そして、アクセルスイッチ１がＯＮ且つクラッチ
スイッチ２がＯＮの状態、即ち、アクセルペダルが踏み
込まれておらずクラッチが接続状態の減速走行時に、排
気ブレーキスイッチ４がＯＮされた場合は、図２に示す
フローチャートに従って、圧縮圧開放式ブレーキスイッ
チ５及びエンジン回転センサ３からの信号に応じて、吸
気絞り弁を開閉制御する。ここで、コントロールユニッ
ト６が制御手段に相当する。The control unit 6 inputs signals from the above-mentioned switches and sensors to drive an exhaust shutter provided in the exhaust passage, an exhaust brake actuator 7, an exhaust valve or a dedicated exhaust valve near the compression top dead center of the engine. The drive control is performed for the compression pressure release brake actuator 8 that drives the valve to open and the intake throttle valve actuator 9 that drives the intake throttle valve provided in the intake passage. FIG. 2 shows the case where the exhaust brake switch 4 is turned on when the accelerator switch 1 is on and the clutch switch 2 is on, that is, when the vehicle is decelerated while the accelerator pedal is not depressed and the clutch is engaged. According to the flowchart, the intake throttle valve is opened / closed in response to signals from the compression pressure release type brake switch 5 and the engine rotation sensor 3. Here, the control unit 6 corresponds to a control means.
【００１２】次に、本実施例装置において、排気ブレー
キ作動時の圧縮圧開放式ブレーキの制動力制御動作につ
いて、図２のフローチャートを参照しながら説明する。
このルーチンは、排気ブレーキスイッチ４がＯＮ操作さ
れた時に開始される。排気ブレーキスイッチ４がＯＮ操
作されると、まず、ステップ１（図中Ｓ１で示し、以下
同様とする）では、排気ブレーキアクチュエータ７に駆
動信号を出力して排気ブレーキを駆動する。Next, the braking force control operation of the compression pressure release type brake during the operation of the exhaust brake in the apparatus of this embodiment will be described with reference to the flowchart of FIG.
This routine is started when the exhaust brake switch 4 is turned on. When the exhaust brake switch 4 is turned on, first, in step 1 (indicated by S1 in the figure, the same applies hereinafter), a drive signal is output to the exhaust brake actuator 7 to drive the exhaust brake.
【００１３】ステップ２では、圧縮圧開放式ブレーキス
イッチ５がＯＮか否かを判定し、ＯＮの時はステップ３
に進む。ステップ３では、圧縮圧開放式ブレーキアクチ
ュエータ８に駆動信号を出力して圧縮圧開放式ブレーキ
を駆動する。ステップ４では、エンジン回転センサ３の
検出したエンジン回転速度Ｎが、予め設定した所定値Ｎ
0 以下か否かを判定し、Ｎ≦Ｎ0 の時は、ステップ５に
進む。In step 2, it is judged whether or not the compression pressure release type brake switch 5 is ON, and if it is ON, step 3
Proceed to. In step 3, a drive signal is output to the compression pressure release type brake actuator 8 to drive the compression pressure release type brake. In step 4, the engine rotation speed N detected by the engine rotation sensor 3 is the predetermined value N set in advance.
It is determined whether or not 0 or less. If N ≦ N 0 , the process proceeds to step 5.
【００１４】ステップ５では、吸気絞り弁アクチュエー
タ９に開弁駆動信号を出力して吸気絞り弁を開弁駆動
し、ステップ２に戻る。一方、ステップ２で、圧縮圧開
放式ブレーキスイッチ５がＯＦＦで判定がＮＯの時、又
は、ステップ４でエンジン回転速度Ｎが所定値Ｎ0 より
高く判定がＮＯの時は、ステップ６に進み、吸気絞り弁
アクチュエータに閉弁駆動信号を出力して吸気絞り弁を
閉弁駆動し、ステップ２に戻る。In step 5, a valve opening drive signal is output to the intake throttle valve actuator 9 to drive the intake throttle valve to open, and the process returns to step 2. On the other hand, in step 2, when the compression pressure release type brake switch 5 is OFF and the determination is NO, or when the engine rotation speed N is higher than the predetermined value N 0 in step 4 and the determination is NO, the process proceeds to step 6. A valve closing drive signal is output to the intake throttle valve actuator to drive the intake throttle valve to close, and the process returns to step 2.
【００１５】従って、排気ブレーキと圧縮圧開放式ブレ
ーキの併用時では、こもり音が比較的小さいエンジン回
転速度Ｎが所定値Ｎ0 以下のエンジン低速域で、吸気絞
り弁を開弁することで、図３の実線で示すように、吸気
絞り弁が閉弁している従来（点線で示す）に比べて圧縮
圧開放式ブレーキにおける制動力を高めることができ
る。また、図３に示すように、Ｎ＞Ｎ0 のエンジン高速
域では、吸気絞り弁を閉弁状態にしても十分な制動力が
得られるので、吸気絞り弁を閉弁状態にして、圧縮圧開
放式ブレーキの動弁系に過大な負荷が作用するのを防止
する。Therefore, when the exhaust brake and the compression pressure release type brake are used together, by opening the intake throttle valve in the engine low speed region where the engine rotation speed N at which the muffled noise is relatively small and the predetermined value N 0 or less, As indicated by the solid line in FIG. 3, the braking force in the compression pressure release type brake can be increased as compared with the conventional case (indicated by the dotted line) in which the intake throttle valve is closed. Further, as shown in FIG. 3, in the engine high speed region of N> N 0 , sufficient braking force can be obtained even when the intake throttle valve is closed, so the intake throttle valve is closed and the compression pressure is reduced. Prevents an excessive load from acting on the valve train of the open brake.
【００１６】[0016]
【発明の効果】以上説明したように、請求項１記載の発
明によれば、排気ブレーキ作動時に圧縮圧開放式ブレー
キの作動スイッチを操作した時に、エンジン回転速度が
所定値以下の低速域では、吸気絞り弁を強制的に開弁す
る構成としたので、排気ブレーキと圧縮圧開放式ブレー
キの併用時におけるエンジン低速域の制動力を向上する
ことができる。また、エンジン高速域では吸気絞り弁を
閉弁状態とするため、圧縮圧開放式ブレーキの動弁系に
過大な負担がかかることを防止でき、圧縮圧開放式ブレ
ーキの耐久性低下を防止できる。As described above, according to the first aspect of the invention, when the operation switch of the compression pressure release type brake is operated at the time of operating the exhaust brake, when the engine speed is in a low speed range below a predetermined value, Since the intake throttle valve is forcibly opened, the braking force in the low engine speed range can be improved when the exhaust brake and the compression pressure release type brake are used together. Further, since the intake throttle valve is closed in the high speed region of the engine, it is possible to prevent an excessive load from being applied to the valve operating system of the compression pressure release type brake, and to prevent deterioration of the durability of the compression pressure release type brake.
【図１】本発明の一実施例を示すブロック図FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】同上実施例の制動制御動作を説明するフローチ
ャートFIG. 2 is a flowchart illustrating a braking control operation of the above embodiment.
【図３】同上実施例の圧縮圧開放式ブレーキの制動力特
性を示す図FIG. 3 is a diagram showing a braking force characteristic of the compression pressure release type brake of the above embodiment.
１ アクセルスイッチ ２ クラッチスイッチ ３ エンジン回転センサ ４ 排気ブレーキスイッチ ５ 圧縮圧開放式ブレーキスイッチ ６ コントロールユニット ７ 排気ブレーキアクチュエータ ８ 圧縮圧開放式ブレーキアクチュエータ ９ 吸気絞り弁アクチュエータ 1 accelerator switch 2 clutch switch 3 engine rotation sensor 4 exhaust brake switch 5 compression pressure release type brake switch 6 control unit 7 exhaust brake actuator 8 compression pressure release type brake actuator 9 intake throttle valve actuator
Claims (1)
ＯＮ操作によって作動する排気ブレーキ及び該排気ブレ
ーキの作動に連動して吸気通路を閉塞する吸気絞り弁を
備えた車両に搭載され、減速走行時に圧縮圧開放式ブレ
ーキ作動スイッチのＯＮ操作によって作動する圧縮圧開
放式ブレーキの制動力制御装置であって、 エンジン回転速度検出手段と、 排気ブレーキ作動時に前記圧縮圧開放式ブレーキ作動ス
イッチのＯＮ信号が入力した時、前記エンジン回転速度
検出手段の検出値が所定値以下の時には前記吸気絞り弁
を開弁制御する制御手段と、 を備えて構成したことを特徴とする圧縮圧開放式ブレー
キの制動力制御装置。1. A vehicle equipped with an exhaust brake that is operated by turning on an exhaust brake operation switch during deceleration travel and an intake throttle valve that closes an intake passage in conjunction with the operation of the exhaust brake, and is compressed during deceleration travel. A braking force control device for a compression pressure release type brake which is operated by turning on a pressure release type brake operation switch, wherein an engine rotation speed detecting means and an ON signal of the compression pressure release type brake operation switch are input when an exhaust brake is operated. When the detected value of the engine speed detecting means is less than or equal to a predetermined value, the control means for controlling the opening of the intake throttle valve is provided, and the braking force control of the compression pressure release type brake. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22972594A JPH0893513A (en) | 1994-09-26 | 1994-09-26 | Braking force controller for compression pressure releasing type brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22972594A JPH0893513A (en) | 1994-09-26 | 1994-09-26 | Braking force controller for compression pressure releasing type brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0893513A true JPH0893513A (en) | 1996-04-09 |
Family
ID=16896724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22972594A Pending JPH0893513A (en) | 1994-09-26 | 1994-09-26 | Braking force controller for compression pressure releasing type brake |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0893513A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004104383A1 (en) * | 2003-05-20 | 2004-12-02 | Tokudaiji Institute Of Automotive Culture Inc. | Diesel engine exhaust gas-purifying device and control means |
| JP2007002779A (en) * | 2005-06-24 | 2007-01-11 | Isuzu Motors Ltd | Internal combustion engine |
| WO2013125439A1 (en) * | 2012-02-24 | 2013-08-29 | いすゞ自動車株式会社 | Device and method for diagnosing internal combustion engine |
| CN103742280A (en) * | 2013-12-31 | 2014-04-23 | 东风康明斯发动机有限公司 | Device and method for automatically selecting brake power of electronic control diesel engine brake |
| KR20180034689A (en) * | 2015-09-01 | 2018-04-04 | 자콥스 비히클 시스템즈, 인코포레이티드. | Method and apparatus for combined engine braking of exhaust engine braking and decompressing engine braking |
| US10072589B2 (en) | 2015-12-22 | 2018-09-11 | Scania Cv Ab | Method for checking the function of a compression release brake system |
| CN115653764A (en) * | 2022-10-17 | 2023-01-31 | 东风商用车有限公司 | Engine braking method, device, equipment and readable storage medium |
-
1994
- 1994-09-26 JP JP22972594A patent/JPH0893513A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004104383A1 (en) * | 2003-05-20 | 2004-12-02 | Tokudaiji Institute Of Automotive Culture Inc. | Diesel engine exhaust gas-purifying device and control means |
| JP2007002779A (en) * | 2005-06-24 | 2007-01-11 | Isuzu Motors Ltd | Internal combustion engine |
| JP4692100B2 (en) * | 2005-06-24 | 2011-06-01 | いすゞ自動車株式会社 | Internal combustion engine |
| WO2013125439A1 (en) * | 2012-02-24 | 2013-08-29 | いすゞ自動車株式会社 | Device and method for diagnosing internal combustion engine |
| JP2013174168A (en) * | 2012-02-24 | 2013-09-05 | Isuzu Motors Ltd | Apparatus and method of diagnosing internal combustion engine |
| CN103742280A (en) * | 2013-12-31 | 2014-04-23 | 东风康明斯发动机有限公司 | Device and method for automatically selecting brake power of electronic control diesel engine brake |
| KR20180034689A (en) * | 2015-09-01 | 2018-04-04 | 자콥스 비히클 시스템즈, 인코포레이티드. | Method and apparatus for combined engine braking of exhaust engine braking and decompressing engine braking |
| US10072589B2 (en) | 2015-12-22 | 2018-09-11 | Scania Cv Ab | Method for checking the function of a compression release brake system |
| CN115653764A (en) * | 2022-10-17 | 2023-01-31 | 东风商用车有限公司 | Engine braking method, device, equipment and readable storage medium |
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