1196 results about "Vehicle acceleration" patented technology

System and method for monitoring a vehicle comprising an accelerometer unit capable of monitoring vehicle accelerations, a processor adapted to receive inputs from the accelerometer unit and to compare the vehicle accelerations to predetermined parameters, wherein an attack on the vehicle is identified when one or more vehicle accelerations exceed an attack threshold, and one or more transmitter units adapted to continuously transmit messages upon occurrence of an attack, wherein the messages comprise a vehicle location.

A method for determining driving characteristics of a vehicle. To provide an enhanced method to determine from a driving characteristics of the vehicle a long term mechanical stress of a vehicle, it is proposed that during operation of the vehicle an acceleration of the vehicle is detected by an acceleration sensor in the vehicle and evaluated by a vehicle analyzing system in the vehicle, wherein a driving parameter occurring during an acceleration event in which the vehicle acceleration is above a predetermined threshold is used to determine a driving characteristics value of the vehicle.

Method for minimizing driver perceptible drive train disturbances during take-off in a hybrid electric vehicle when maximized power is often desired is disclosed. The method includes sensing an actual state-of-charge (SOC) value of a battery in a hybrid electric vehicle and a traveling velocity of the vehicle during take-off operation. The sensed actual SOC value is compared with a SOC reference value and computing a delta SOC value as a difference therebetween. A velocity-based SOC calibration factor is looked up that corresponds to the traveling velocity of the vehicle. A combination is utilized of the delta SOC value and the SOC calibration factor as a SOC feedback engine speed control instruction to an engine controller of the hybrid electric vehicle. A driver's desired vehicular acceleration is sensed based on accelerator position. Maximum possible engine power generatable at the sensed vehicle speed is determined, as is a required power value from the power train of the vehicle to meet the driver's desired vehicular acceleration. The maximum possible engine power generatable at the sensed vehicle speed is compared with the required power value and computing a delta power train requirement value as a difference therebetween. A velocity-based and accelerator position-based power calibration factor is looked-up that corresponds to the traveling velocity of the vehicle and the accelerator position. A combination of the delta power train requirement value and the power calibration factor is utilized as a power requirement feed-forward engine speed control instruction to an engine controller of the hybrid electric vehicle.

A work vehicle having a hydrostatic drive system provides for the recovery and reuse of the vehicle's kinetic energy by conducting pressurized hydraulic fluid out of the hydrostatic drive system into an accumulator during vehicle deceleration, and conducting the pressurized fluid back into the drive system during vehicle acceleration to assist the vehicle's engine in accelerating the vehicle.

A system for controlling an engine in a fuel efficient manner includes a memory having stored therein an engine output characteristics map bounded by a maximum engine output curve. The map defines a region of undesirable operation having a first border defined as a function of engine speed and intersecting the maximum engine output curve. A control computer is configured to control engine operation in a fuel efficient manner by limiting engine operation within the map to the first border while also allowing the engine to operate anywhere on the maximum engine output curve. The control computer may be configured to so limit engine operation to the first border only if an engine or vehicle acceleration value is outside of an acceleration range, and further only if an engine work value is greater than an engine work threshold, and otherwise to allow engine operation anywhere on or within the map.

A method for operating an automatic speed control system of an automotive vehicle. Initially, in a normal follow mode, a setpoint distance between the vehicle and a preceding vehicle is set to a first value d₁, and a setpoint vehicle acceleration is into a first value a₁. Upon detection of an intention of the vehicle driver to overtake the preceding vehicle (such as switching on a turn indicator), the setpoint distance is reset to a second value d₂ that is smaller than d₁. The setpoint acceleration may be reset to a second value a₂ greater than a₁ simultaneously, or the second value a₂ may be set upon detection of initiation of a lane change into an overtaking lane (such as turning a steering wheel). The method assists the driver during the execution of an overtaking process, and a safer, more comfortable and free-flowing sequence of the overtaking process is ensured.

The present invention provides a technique for controlling creep torque to prevent a vehicle from rolling backward on an upward slope. In particular, a gradient of a road is calculated in real time from a detection value of a sensor and vehicle acceleration. A maximum creep torque for preventing roll-back caused by gravity according to the gradient is calculated using the gradient and vehicle information. A first creep torque reference is calculated based on the maximum creep torque and the vehicle speed. A second creep torque reference is calculated based on the maximum creep torque and the vehicle acceleration. A torque command value according to an operation state of a brake is calculated based on the first creep torque reference value and the second creep torque reference value and the gradient. In response, a torque output of a driving motor is controlled according to the calculated torque command value.

A cooling system for an internal combustion engine incorporating a heat accumulator to temporarily store heat during peak heat loads. In automotive vehicles, the heat accumulator may store excess heat generated during vehicle acceleration or hill climbing and it may dissipate stored heat during vehicle cruise, deceleration, or engine idle. The heat accumulator contains phase change material with a solid-to-liquid transition temperature higher than the normal operating temperature of the cooling system. The invention enables reducing the size and weight of engine cooling system without compromising its performance. This is particularly important for improving fuel economy and reduction of emission in automotive vehicles. In addition, the invention enables reducing the coolant inventory in the system thereby allowing for faster engine warm-up and reduced emissions of harmful pollutants during a cold engine start. The invention may be also used for thermal management of engine oil, transmission fluid, or hydraulic fluid.

When a vehicle is started on an uphill road, slip may easily occur between vehicle wheels and a sloping road surface. When vehicle condition is changed from its stopping condition to its traveling condition on the uphill road, vehicle acceleration is controlled in a feed-back operation in such a manner that a target acceleration is made smaller as road gradient becomes larger or coefficient of friction becomes smaller.

A method and system for stabilizing a vehicle employing an electric power steering system is disclosed. The method includes receiving as inputs, a desired torque command representative of a steering wheel torque and a vehicle speed signal. The method also includes acquiring an acceleration signal representative of vehicle acceleration. The method further comprises generating an assist torque command, which is a combination of the desired torque command and a compensating torque command where the compensating torque command is responsive to the vehicle speed signal and the acceleration signal.

When a vehicle travels along a curve of a road, a target vehicle acceleration/deceleration that is used for accelerating/decelerating the vehicle to a target vehicle speed, which is set for the curve, is calculated. Based on a comparison between a present vehicle speed of the vehicle and the target vehicle speed, the vehicle is controlled such that an acceleration/deceleration of the vehicle coincides with the target vehicle acceleration/deceleration.

Disclosed herein is an adaptive cruse control method on an incline to improve traveling performance and stoppage maintenance performance on an incline. During adaptive cruise control, a gradient of a road is estimated based on a vehicle acceleration and longitudinal acceleration to enable compensation of a resistance torque with respect to the gradient of the road, which prevents deterioration of a traveling speed of a vehicle on an incline. Also, compensating for a brake torque to prevent the vehicle from being pushed rearward when the vehicle is stopped or starts to go on an incline may prevent deterioration of performance on an incline.

The invention discloses a vehicle and a vehicle hill starting control method and a hill starting control apparatus, wherein the method comprises: acquiring vehicle speed, an accelerator opening degree, engine rotation speed, clutch shaft speed, road slope and clutch output torque; calculating vehicle acceleration torque and vehicle resistance torque based on the clutch output torque, the road slope and the clutch shaft speed; calculating the target vehicle speed based on the road slope and the accelerator opening degree; calculating the target acceleration torque of a vehicle based on the difference value between the calculated target vehicle speed and the vehicle speed, the road slope and the accelerator opening degree; calculating the torque that an engine needs and the clutch target torque based on the target acceleration torque of the vehicle, the vehicle resistance torque and the engine rotation speed; and controlling the engine output torque to reach the torque that the engine needs and the clutch output torque reach the clutch target acceleration torque so as to make the vehicle speed reach the target vehicle speed and the vehicle acceleration torque reach the target acceleration torque of the vehicle, thus controlling the vehicle speed and the vehicle acceleration speed and rapidly realizing the intention of a driver.

An anti-rollback vehicle control system reduces vehicle rollback by restarting an engine based on a grade, a brake signal, and a calculated brake release rate. In a hybrid vehicle, the control system restarts the vehicle engine and electric motor. In a conventional powertrain vehicle that utilizes a transmission with a neutral-idle mode, the control system directs the transmission to exit neutral-idle mode. The grade may be estimated based on a vehicle acceleration rate, a vehicle driving force, and resistance factors.

The invention relates to a method for indentifying a noise source that produces noise when a vehicle accelerates, and belongs to the technical field of vehicle noise control. The method comprises the following steps: when the vehicle accelerates or travels at a uniform speed, the noise source signal, the vibration source signal, the speed signal, the response point sound pressure signal, the vehicle position signal and the like are collected; the transfer function matrix from the noise source and the vibration source to the response point is calculated; the changing response point sound pressure during the process of acceleration is synthesized and computed; and the sensitivity and the contribution degree of each noise source and vibration source are calculated. The invention has the following advantages: the noise source signal, the vibration source signal, the vehicle travelling state signal, and the ground response point sound pressure signal, which are collected during the running of the vehicle, can be utilized for accurately identifying the noise source that produces noise during the acceleration; and the quantitative relationship between the response point noise signal and each noise source is obtained and can provide a reliable basis for the reduction of noise produced by the acceleration of a running vehicle.

The invention relates to a dynamic load simulating device and a dynamic load simulating method for an automobile power system test, and belongs to the technical field of vehicle power system tests. The dynamic load simulating device comprises a control computer, a dynamometer controller, a frequency converter, an alternating current (AC) power dynamometer and a torque flange with a controller. A virtual automobile model-based control algorithm is adopted, a virtual automobile model is driven by an actual measurement torque, and the simulation of the rolling resistance, wind resistance and the inertia resistance of a vehicle is realized under the conditions of not calculating angular acceleration of the dynamometer. The dynamic load simulating device and the dynamic load simulating method have high stability and high simulation precision, are favorable for shortening the development cycle of an automobile power system and providing convenient test environment for the development of the power system. A process that the vehicle acceleration is acquired by differentiating the rotation speed of the automobile power system is avoided in the calculation process, and a phenomenon that accurate differential values are difficult to acquire due to relatively large noise caused by the process of differentiating the rotation speed is prevented.

A method for monitoring an electronically controlled drive unit of a vehicle uses actual vehicle acceleration and a preselected vehicle acceleration. Actual acceleration is determined from any of an acceleration sensor or vehicle speed sensors. When actual acceleration is greater than the preselected acceleration, a reaction is initiated to reduce vehicle acceleration.

An electric controller starts post-collision control when an acceleration of the vehicle detected by means of sensors mounted on the vehicle is greater than an acceleration threshold (i.e., after occurrence of a collision of a vehicle). In the post-collision control, the electric controller fixes the throttle valve opening to a predetermined value, and shifts the transmission from the present gear position to an adjacent lower-side gear position. Moreover, the electric controller controls the hydraulic pressure of the brake such that the vehicle deceleration in the front-rear direction detected by means of the sensors becomes a target deceleration.

Methods and systems for identifying a spatial relationship between a frame of reference associated with an accelerometer mounted in a vehicle and a frame of reference associated with the vehicle Accelerometer data is received from an accelerometer and vehicle data is received from a vehicle network of the vehicle, a long term average of the accelerometer data is used to determine the direction of gravity in the frame of reference of the vehicle. In addition the vehicle date is used to determine changes in speed of the vehicle, and thus to determine the direction of the longitudinal axis of the vehicle in the frame of reference of the vehicle. From these determined directions, the spatial relationship between the frames of reference may be determined.

The invention relates to the field of vehicle safety driving control, and particularly relates to a driving behavior analysis system and analysis method. The system comprises a driver fatigue tester which acquires the current fatigue value of a driver, a vehicle driving state tester which acquires the current driving behavior value of a driving vehicle, a vehicle acceleration tester which acquires an acceleration value in the vehicle driving process, a calculator which calculates the driving behavior score of the driver according to the current fatigue value, the current driving behavior value and the acceleration value, and a remote server which receives and stores the driving behavior score, and reminds the driver to avoid fatigue driving or violation driving when the driving behavior score is low. The remote server receives and stores the driving behavior score, and stores each time of driving behavior score record of the driver. The analysis system and the analysis method are conducive to safe driving of the driver.

An apparatus is provided to estimate a gradient of a road surface on which a vehicle travels. The apparatus comprises acquisition, estimation, and compensation members. The acquisition member acquires at least one of acceleration of the vehicle calculated on changes in a travel speed of the vehicle and acceleration sensed from a force applied to the vehicle. The estimation means estimates the gradient of the road surface based on the acquired acceleration. The compensation member compensates the acquired acceleration in terms of influence of noise superposed on the acceleration, depending on an operational condition of the vehicle. The compensated acceleration is used by the estimation. The compensation is carried out by cutting off the noise by a filter, for example.

Automotive electronic control unit programmed to realtime estimate either or both of vehicle mass and road slope, wherein; a. road slope, is estimated; a1. when vehicle is considered stopped based on an accelerometer signal indicative of vehicle acceleration, wherein the vehicle is considered stopped in the presence of substantially zero values of a speed signal indicative of vehicle speed, and a2. when vehicle is in rectilinear and curvilinear motion by implementing a road slope observer based on a linear Kalman filter, which is designed to: a21. operate based on signals indicative of vehicle speed and acceleration, and a22. compensate for accelerometric disturbances due to; a221. vehicle static pitch resulting from vehicle load distribution, and a222. vehicle dynamic pitch due to acceleration to which vehicle is subjected during motion, and a223. accelerometric disturbance components due to vehicle lateral dynamics; b. vehicle mass is estimated: b1. when vehicle is in motion, and b2. based on a recursive least square algorithm with forgetting factor, and b3. based on an accelerometric signal indicative of vehicle acceleration, on a vehicle speed signal, and other signals representing a vehicle propulsive/resistive torque, and b4. at different low gears, to provide a mass estimation and an associated variance for each gear, and b5. based on mass estimations and corresponding variances for each gear, and b6. compensating for accelerometer disturbances due to: b61, vehicle dynamic pitch; and b62. accelerometrie disturbance components due to vehicle lateral dynamics; and b7. minimizing uncertainties on propulsive/resistive torque due to gear efficiency and roiling resistance.